EzRay M18 (Model: VMX-P400) is a portable X-ray system, intended for use by a qualified/trained physician or technician to acquire X-ray images of the desired parts of a patient's anatomy on adult and pediatric patients (including head, chest, abdomen, cervical spine, and extremities). The device may be used for handheld diagnostic imaging of body extremities. The system is subject to the following limitations of use when stand-mounted: - The device may be used for diagnostic imaging of the head, abdomen, cervical spine, or extremities. - The device may be used for imaging of the chest when used without a grid. This device is not intended for mammography.
Device Story
EzRay M18 is a portable X-ray system powered by a 57.6 Vdc rechargeable Li-ion battery. It consists of an X-ray tube, device controller, power controller, user interface, and beam-limiting collimator. Operated by qualified physicians or technicians in clinical settings, it generates X-ray radiation to acquire images of patient anatomy. The device supports handheld imaging for extremities and stand-mounted imaging for other body parts. It uses a high-frequency generator to produce X-ray outputs; clinicians view resulting images via external FDA-cleared digital detectors (not included). The device aids in diagnostic decision-making by providing radiographic images equivalent to existing stationary and portable systems. Benefits include portability for point-of-care imaging.
Clinical Evidence
Bench testing only. No clinical data. Image performance (MTF, spatial frequency, DQE, NPS) was compared against the XR5 reference device using an FDA-cleared 1417WCC flat-panel detector. Results demonstrated equivalent image quality. Safety and performance testing conducted per IEC 60601-1, IEC 60601-1-2, IEC 60601-1-3, IEC 60601-2-28, IEC 60601-2-54, and IEC 62133-2. Compliance with 21 CFR 1020.30 and 1020.31 confirmed.
Technological Characteristics
Portable X-ray system; 57.6 Vdc Li-ion battery power; high-frequency generator (1.8 kW); Canon D-0814 X-ray tube. Features manual, steplessly adjustable collimator with LED light field indicator. User interface uses soft-touch push buttons. Dimensions: 214 x 305 x 309 mm; Weight: 5.88 kg. Software level of concern: Moderate. Standards: IEC 60601-1, 60601-1-2, 60601-1-3, 60601-2-28, 60601-2-54, IEC 62133-2.
Indications for Use
Indicated for adult and pediatric patients for diagnostic X-ray imaging of head, chest, abdomen, cervical spine, and extremities. Handheld use limited to extremities. Stand-mounted use limited to head, abdomen, cervical spine, extremities, and chest (without grid). Not for mammography.
Regulatory Classification
Identification
A mobile x-ray system is a transportable device system intended to be used to generate and control x-ray for diagnostic procedures. This generic type of device may include signal analysis and display equipment, patient and equipment supports, component parts, and accessories.
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February 11, 2022
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Vatech Co., Ltd. % Mr. Dave Kim Contact Title Medical Device Regulatory Affairs Mtech Group 7707 Fannin St., Ste. 200-V111 HOUSTON TX 77054
# Re: K213462
Trade/Device Name: EzRay M18 (Model: VMX-P400) Regulation Number: 21 CFR 892.1720 Regulation Name: Mobile x-ray system Regulatory Class: Class II Product Code: IZL Dated: January 7, 2022 Received: January 13, 2022
## Dear Mr. Kim:
We have reviewed your Section 510(k) premarket notification of intent to market the device referenced above and have determined the device is substantially equivalent (for the indications for use stated in the enclosure) to legally marketed predicate devices marketed in interstate commerce prior to May 28, 1976, the enactment date of the Medical Device Amendments, or to devices that have been reclassified in accordance with the provisions of the Federal Food, Drug, and Cosmetic Act (Act) that do not require approval of a premarket approval application (PMA). You may, therefore, market the device, subject to the general controls provisions of the Act. Although this letter refers to your product as a device, please be aware that some cleared products may instead be combination products. The 510(k) Premarket Notification Database located at https://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfpmn/pmn.cfm identifies combination product submissions. The general controls provisions of the Act include requirements for annual registration, listing of devices, good manufacturing practice, labeling, and prohibitions against misbranding and adulteration. Please note: CDRH does not evaluate information related to contract liability warranties. We remind you, however, that device labeling must be truthful and not misleading.
If your device is classified (see above) into either class II (Special Controls) or class III (PMA), it may be subject to additional controls. Existing major regulations affecting your device can be found in the Code of Federal Regulations, Title 21, Parts 800 to 898. In addition, FDA may publish further announcements concerning your device in the Federal Register.
Please be advised that FDA's issuance of a substantial equivalence determination does not mean that FDA has made a determination that your device complies with other requirements of the Act or any Federal statutes and regulations administered by other Federal agencies. You must comply with all the Act's requirements, including, but not limited to: registration and listing (21 CFR Part 807); labeling (21 CFR Part
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801); medical device reporting of medical device-related adverse events) (21 CFR 803) for devices or postmarketing safety reporting (21 CFR 4, Subpart B) for combination products (see https://www.fda.gov/combination-products/guidance-regulatory-information/postmarketing-safety-reportingcombination-products); good manufacturing practice requirements as set forth in the quality systems (QS) regulation (21 CFR Part 820) for devices or current good manufacturing practices (21 CFR 4. Subpart A) for combination products; and, if applicable, the electronic product radiation control provisions (Sections 531-542 of the Act); 21 CFR 1000-1050.
Also, please note the regulation entitled, "Misbranding by reference to premarket notification" (21 CFR Part 807.97). For questions regarding the reporting of adverse events under the MDR regulation (21 CFR Part 803), please go to https://www.fda.gov/medical-device-safety/medical-device-reportingmdr-how-report-medical-device-problems.
For comprehensive regulatory information about mediation-emitting products, including information about labeling regulations, please see Device Advice (https://www.fda.gov/medicaldevices/device-advice-comprehensive-regulatory-assistance) and CDRH Learn (https://www.fda.gov/training-and-continuing-education/cdrh-learn). Additionally, you may contact the Division of Industry and Consumer Education (DICE) to ask a question about a specific regulatory topic. See the DICE website (https://www.fda.gov/medical-device-advice-comprehensive-regulatoryassistance/contact-us-division-industry-and-consumer-education-dice) for more information or contact DICE by email (DICE@fda.hhs.gov) or phone (1-800-638-2041 or 301-796-7100).
Sincerely,
Laurel Burk, Ph.D. Assistant Director Diagnostic X-ray Systems Team Division of Radiological Health OHT7: Office of In Vitro Diagnostics and Radiological Health Office of Product Evaluation and Quality Center for Devices and Radiological Health
Enclosure
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# Indications for Use
510(k) Number (if known) K213462
Device Name EzRay M18 (Model: VMX-P400)
| Indications for Use (Describe) | |
|--------------------------------|--|
|--------------------------------|--|
EzRay M18 (Model: VMX-P400) is a portable X-ray system, intended for use by a qualified/trained physician or technician to acquire X-ray images of the desired parts of a patient's anatomy on adult and pediatric patients (including head, chest, abdomen, cervical spine, and extremities).
The device may be used for handheld diagnostic imaging of body extremities.
The system is subject to the following limitations of use when stand-mounted:
- The device may be used for diagnostic imaging of the head, abdomen, cervical spine, or extremities.
- The device may be used for imaging of the chest when used without a grid.
This device is not intended for mammography.
X Prescription Use (Part 21 CFR 801 Subpart D)
| Over-The-Counter Use (21 CFR 801 Subpart C)
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# Section 5 – 510(k) Summary K213462
## 1. Traditional 510(k) Summary
This summary of 510(k) information is being submitted in accordance with requirements of 21 CFR Part 807.92.
#### 2. Date 510K Summary prepared: January 7, 2022
#### 3. Administrative Information
| Official Correspondent: | Dave Kim / Mtech Group<br>Address: 7705 Fannin St., Ste. 610, Houston, TX 77054<br>Tel: +713-467-2607<br>Contact person: Mr. Dave Kim (davekim@mtech-inc.net) |
|-------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| 510(k) Submitter: | VATECH Co., Ltd.<br>Address: 13, Samsung 1-ro 2-gil, Hwaseong-si, Gyeonggi-do, 18449, Korea<br>Tel: +82-31-379-9492<br>Fax: +82-31-379-9400<br>Contact person: Daniel Kim / Manager (daniel.kim@vatech.com) |
#### 4. Device Information
| Type of 510(k) Submission: | Traditional |
|----------------------------|---------------------------------------|
| Trade or Proprietary Name: | EzRay M18 (Model: VMX-P400) |
| Common or Usual Name: | Medical Portable X-ray System |
| Regulation Classification: | Mobile X-ray system (21 CFR 892.1720) |
| Product Code: | IZL |
| Class of Device: | Class II |
| Panel: | Radiology |
### 5. Predicate Device Information
| Manufacturer: | MinXray, Inc. |
|----------------------------|---------------------------------------|
| Trade or Proprietary Name: | TR90BH |
| Common or Usual Name: | Mobile Diagnostic X-Ray System |
| Regulation Classification: | Mobile X-ray system (21 CFR 892.1720) |
| Product Code: | IZL |
| Class of Device: | Class II |
| Panel: | Radiology |
| 510(k) Number: | K 182207 |
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#### 6. Reference Device Information
| Manufacturer: | OSKO, Inc. |
|----------------------------|-------------------------------------------|
| Trade or Proprietary Name: | XR5 |
| Common or Usual Name: | Stationary x-ray system |
| Regulation Classification: | Stationary x-ray system (21 CFR 892.1680) |
| Product Code: | KPR |
| Class of Device: | Class II |
| Panel: | Radiology |
| 510(k) Number: | K150663 |
#### 7. Device Description
EzRay M18 (Model: VMX-P400), a medical portable X-ray system, operates on 57.6 Vdc supplied by a rechargeable Li-ion battery pack. The system is composed of an X-ray generating part including an X-ray tube, a device controller, a power controller, a user interface, a beam limiting part, and two optional components: remote controller and stand. The device software supports the EzRay M18 system, and the software is of Moderate level of concern. The device is designed for the human body using image receptors. The image detectors, a necessary component for a fully-functional x-ray system, are not part of this submission.
### 8. Indications for use
EzRay M18 (Model: VMX-P400) is a portable X-ray system, intended for use by a qualified/trained physician or technician to acquire X-ray images of the desired parts of a patient's anatomy on adult and pediatric patients (including head, chest, abdomen, cervical spine, and extremities).
The device may be used for handheld diagnostic imaging of body extremities.
The system is subject to the following limitations of use when stand-mounted:
- The device may be used for diagnostic imaging of the head, abdomen, cervical spine, or extremities.
- The device may be used for imaging of the chest when used without a grid.
This device is not intended for mammography.
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# 9. Substantial Equivalence Chart
| | Subject Device | Predicate Device | Reference Device | |
|-----------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------------------|
| Device Name | EzRay M18 (Model: VMX-P400) | TR90BH | XR5 | |
| Applicant Name | VATECH Co., Ltd. | MinXray, Inc. | OSKO, INC. | |
| 510(k) Number | K213462 | K182207 | K150663 | |
| Device Classification Name | Mobile X-ray system | Mobile X-ray system | Stationary X-ray system | |
| Classification Product Code | IZL | IZL | KPR | |
| Regulation Number | 21 CFR 892.1720 | 21 CFR 892.1720 | 21 CFR 892.1680 | |
| Regulation Class | II | II | II | |
| Indications for Use | EzRay M18 (Model: VMX-P400) is<br>a portable X-ray system, intended<br>for use by a qualified/trained<br>physician or technician to acquire<br>X-ray images of the desired parts<br>of a patient's anatomy on adult<br>and pediatric patients (including<br>head, chest, abdomen, cervical<br>spine, and extremities).<br>The device may be used for<br>handheld diagnostic imaging of<br>body extremities.<br>The system is subject to the<br>following limitations of use when<br>stand-mounted:<br>- The device may be used for<br>diagnostic imaging of the head,<br>abdomen, cervical spine, or<br>extremities.<br>- The device may be used for<br>imaging of the chest when used<br>without a grid.<br>This device is not intended for<br>mammography. | The TR90BH is a portable X-ray system with<br>following limitations of use:<br>The device may be used for handheld<br>diagnostic imaging of body extremities<br>The device may be used for stand mounted<br>diagnostic imaging of head, abdomen, or<br>extremities.<br>The device may be used for stand mounted<br>imaging of the chest when used without a<br>grid.<br>- Not to be used on bariatric patients,<br>unless imaging body extremities<br>- Not for mammography use<br>- The TR90BH is not intended to replace a<br>stationary radiographic system, which may<br>be required for full optimization of image<br>quality and radiation exposure for different<br>exam types. | The XR5 diagnostic X-ray system<br>is intended for use on adult and<br>pediatric patients for taking<br>diagnostics radiographic<br>exposure of all body parts and<br>operated by a qualified/trained<br>doctor or technician. The XR5<br>diagnostic X-ray system is<br>designed to be used with<br>conventional film/screen, CR<br>cassettes or digital detectors.<br>NOT intended for<br>Mammography use. | |
| | | | | |
| | Size: Body | 214 x 305 x 309 mm<br>(excluding Skin Distance Bar) | 219 x 442 x 190 mm | 1,940 mm (Tube stand height),<br>1,480 mm (Vertical movement),<br>2,540 mm (Longitudinal<br>movement) |
| Technol<br>ogical | Weight | 5.88 kg | 7.5 kg | - |
| | Collimator | Four manually and steplessly<br>adjustable shutters with LED<br>Light<br>x-ray field indicator | Mikasa BLD34L | Manual (K062788) |
| | User Interface | Soft touch push buttons | Soft touch push buttons | push buttons |
| | Energy source | Rechargeable 57.6 V DC<br>Li-ion battery pack | Lithium-ion Rechargeable Battery<br>(57.6DC), 300 exposures per charge. | 110-220 VAC |
| | Exposure times | 0.02 sec - 2.0 sec: R'20 sec Step<br>(Exposure conditions follow R'20<br>in combination of mAs) | 0.01 sec - 1.0 sec : 0.01 sec Step<br>High Power Mode<br>0.01 sec - 0.3 sec : 0.01 sec Step | 6.3 sec Max. |
| | mA | 20 mA @ 40 - 90 kV (1 kV steps)<br>15 mA @ 61 – 90 kV (1 kV steps)<br>10 mA @ 81 – 90 kV (1 kV steps) | 20 mA @ 40 kVDC – 60 kVDC (2 kVP steps)<br>15 mA @ 62 kVDC – 80 kVDC (2 kVP steps)<br>10 mA @ 82 kVDC – 90 kVDC (2 kVP steps)<br>High Power Mode<br>15 mA @ 82 kVDC – 90 kVDC (2 kVP steps) | 10 - 500 mA |
| | Memory<br>settings | 10 memories via pushbutton | 5 memories via pushbutton | No |
| | HF Generator | High Frequency | High Frequency | High Frequency |
| | kW | 1.8 kW | 1.35 kW | 40 kW |
| | kVp | 40 – 90kVp | 40 – 90kVp | 40-125 kVp |
| | X-ray Tube | D-0814 | D-0814 | E7239x |
| | FDA Performance Standard | Complies | Complies | Complies |
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#### VATECH Co., Ltd. Premarket Notification 510(k)=
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#### 9. The differences between the subject device and the predicate device
The subject device described in this traditional 510(k) is similar to the predicate device (K182207) in its indications for use and technological application. Both the subject and predicate devices are taking diagnostic Xrays using a variable tube voltage (kVp) and current time product (mAs) or exposure time. The collimator of the EzRay M18 device is a continuously adjustable light beam type similar to the predicate TR90BH. The user can irradiate X-ray by adjusting the X-ray filed size of the desire body part. Exposure parameters are similar for both EzRay M18 and TR90BH using the same Canon X-ray tube model D-However, EzRay 18 has a larger capacity of the X-ray mono tank within the X-ray tube spec, resulting in 0814. higher exposure output. The high power mode of the predicate device, TR90BH, is 15 mA, the output (KW) is 1.35 kW for the maximum tube voltage 90kV. EzRay M18 emits a maximum of 20 mA and the output of 1.8 kW when the maximum tube voltage is 90kV. Because EzRay M18 is capable of setting a higher mA under the same maximum tube voltage of 90kV, it is possible to capture radiographic images of the same body parts intended for the predicate device. For the energy source, battery pack, the subject device receives power from the built-in rechargeable Li-ion battery pack which as same as the predicate device (K182207) uses. Rechargeable Li-ion battery pack has been tested and is in conformity with the standard IEC 62133. Other differences include device design such as exposure time, size and user interface.
#### 10. Non clinical Testing
Testing was performed successfully according to the following standards:
- IEC 60601-1:2005, COR1:2006, COR2:2007, AMD1:2012 ●
- . IEC 60601-1-2:2014
- . IEC 60601-1-3:2008 (Second Edition) + A1:2013
- IEC 60601-2-28:2017
- IEC 60601-2-54:2009, AMD1:2015, AMD2:2018
- IEC 62133-2:2017
Furthermore, the following Specific Guidance Document was utilized in the device development to ensure the safety of this device for both the operators and patients:
"The Content of Premarket Submissions for Software Contained in Medical Devices" "Radiation Safety Consideration for X-ray Equipment Designed for Hand-Held Use"
The device also conforms to the following:
21 CFR 1020 Subchapter J: Performance Standards for Ionizing Radiation Emitting Products
21 CFR 1020.30: Diagnostic x-ray system and their major components
21 CFR 1020.31: Radiographic Equipment
Image performance testing was performed on the EzRay M18 in comparison with a reference device XR5 (K150663) using a FDA-cleared flat-panel detector, 1417WCC (K171418). The results of MTF, spatial frequency, DQE and NPS were compared under the same exposure conditions. The results demonstrated that the general image performance of the subject device is equivalent to the reference device. The difference between the two devices is that EzRay M18 is a portable X-ray system whereas the reference device is a stationary diagnostic X-ray system. It is concluded that EzRay M18 demonstrated adequate image quality performance through comparative study with the reference device.
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## 11. Conclusions
In reference to the comparison information provide in Substantial Equivalence Chart, the subject device and the predicate device have little difference with its technological features. As demonstrated in the performance bench testing, X-ray performance and X-ray Safety of the subject device was tested in accordance with Federal standard 21CFR Part 1020.30 and 31 as well as international standards such as IEC 60601-1, 60601-2-54. Quality assurance procedures are adhered to, and the specifications and functional requirements were met as the test results indicated.
In accordance with the Federal Food, Drug and Cosmetic Act, 21 CFR Part 807 and based on the information provided in this premarket notification. VATECH Co., Ltd. concludes that EzRay M18 (Model: VMX-P400) is substantially equivalent to the predicate device and its image quality performed equivalently in comparison with XR5 (K150663) using 1417WCC, a FDA-cleared digital detector (K171418) under the same exposure condition.
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1. Search: exact and fuzzy
Type a phrase like "coronary artery calcification" into the search box. You get two kinds of results. Exact results match the literal phrase — prefix searches work ("coronary artery calcificati") but suffix searches do not. Fuzzy results match on the meaning and intent of your phrase rather than the exact words, and are sorted by relevance score. Hover over the Exact or Fuzzy badge on any row to see exactly why it matched.
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Exact vs. fuzzy search: what's the difference?
Exact matches on the literal phrase (prefix search works, suffix does not). Fuzzy matches on the meaning and intent of the phrase rather than the exact words. Hover over the badge on any row to see why it matched.
You search "coronary artery calcification" and want only software devices with AI. What two filters do you apply?
Narrow by SaMD (software-only devices), then narrow by AI/ML (devices with AI).
2. The results table
Scroll right in the results table. The intended use is extracted for you — no need to open the PDF. The device story gives a high-level snapshot of what the device does and how it's used. The AI Performance sub-table shows each output name, acceptance criteria, observed values, and development/test dataset descriptions — the same format Innolitics uses for regulatory strategy outputs, and the fastest high-level fingerprint of an AI device. It is AI-generated but has been very reliable in practice.
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Scroll right in the search results table. The intended use column is extracted for you; no need to dig into the 510(k) summary PDF.
What does the AI Performance sub-table show, and why is it useful?
Output name, acceptance criteria, observed values, development dataset description, and test dataset description. It's the same format we use for regulatory strategy output and Fast 510(k) input, and the fastest high-level fingerprint of an AI device. AI-generated but reliable in practice.
3. Judging fuzzy relevance
Fuzzy results trail off in relevance as you scroll. Use three signals to decide how far down to go: the fuzzy badge explanations, the intended use column, and whether your target output (e.g., Cobb angle) still appears in the AI Performance sub-table. Once it stops appearing, you're past the relevant zone. A top hit with a low score (~0.4) and a stretched explanation is a hint the closest predicates are far away — the project may be headed for De Novo. Note the fuzzy search is a pattern match: it doesn't handle negation ("not") well, and hardware devices can appear — filter by SaMD/AI ML to cut them.
How do you judge how far down fuzzy search results to go?
Use the relevancy signals: the fuzzy badge explanations, the intended use column, and whether the target output (e.g., Cobb angle) still appears in the AI Performance sub-table. Once it stops appearing, results are trailing off in relevancy.
4. Device detail page: chat and citations
Click a device name to open its detail page: device facts on the left, a chat window on the right. Ask something like "Describe the training data". The answer carries little citation bubbles — click one to jump to the highlighted passage in the source PDF, so you can verify every AI answer against the document. There's also a Download PDF button for sharing.
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Reading rule for every project: how many summaries do you read in full?
At least the three most relevant 510(k) or De Novo summaries, in full. After that, use targeted chat questions to confirm your memory quickly. The tool supports this professional habit — it doesn't replace it.
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Select multiple rows in the results table (aim for under ~10), then open the PDF Viewer tab. Ask one question — it goes to all selected devices in parallel, each with citations. This is the fastest way to compare and contrast devices: training data, PCCP scope, how they handled adding new scanners, and so on.
What does the side-by-side PDF viewer mode do?
Select multiple devices, open the PDF viewer tab, and ask one question (e.g., "Describe the training data"). It queries all selected devices simultaneously with citations, so you can compare and contrast quickly.
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With rows selected, go to the Collections tab and create a labeled collection (e.g., "Cobb Angle Project"). Reload that selection any time — before a client call, pull up the collection and ask questions across all of its devices at once.
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Browse product codes and regulation numbers, read the identification text and special controls, browse sibling product codes, open device PDFs on the right, and search by product code or regulation number at the top of the tree.
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Click Show Chart and segment by regulation number (or product code) to see which regulations dominate your result set. Clicking a regulation takes you into the regulations tree. Great for spotting that most matches are, say, hardware laparoscopic devices — a cue to go back and filter.
How do you see which regulations dominate a search result set?
Click "Show Chart" and segment by Regulation Number. Clicking a regulation takes you to the regulations tree.
9. The predicate graph
Open the Predicates tab for a family-tree view of predicate relationships. Click a node to trace its parents and children; selections from search carry over pre-selected. Commonly predicated devices are worth reading — a lot of people predicated them for a reason. The visual lineage is also handy on client calls, e.g. to show how a predicate family evolved and justify why your predicate still holds.
In the predicate graph, why are commonly predicated devices worth reading?
A lot of people predicated them for a reason. Clicking a node traces parents and children, and selections from search carry over pre-selected.
10. Embeddings: the galaxy map
The Embeddings tab plots every matching document in a 2-D "galaxy map" where semantically similar devices cluster together. Hover or click clusters to explore, and let AI label the clusters for you. Embeddings beat product codes for grouping: two devices can carry different product codes (LLZ vs. QIH) yet do the same thing — the embedding captures the meaning of the intended use and device story. This is also exactly how retrieval-augmented generation (RAG) works under the hood, and it makes a great visual on client calls.
Try it yourself
Head to the search page and work through a few of these AI/ML fuzzy searches to build intuition: perivascular fat on CT · aortic valve calcification opportunistic screening on noncontrast CT · breast cancer prediction on digital pathology slides · autism detection · gestational age prediction · a hearing aid that can also detect a pulse · foundation model based analysis of ECG · large language models · penetration test. Watch how the relevance scores, intended use, and AI Performance tables tell you when results stop being meaningful.