The LumaGEM™ scintillation camera is a gamma camera system, which is intended for measuring and imaging the distribution of radionuclides in the human body by means of photon detection. These images are intended to be interpreted by qualified medical personnel.
Device Story
LumaGEM™ is a scintillation gamma camera for planar imaging; detects photon radiation from radionuclides in human body. System utilizes scintillator coupled with position-sensitive photomultiplier tubes (PSPMTs) to convert radiation into electrical signals; signal analysis and display equipment process inputs into images. Operated by qualified medical personnel in clinical settings. Reduced weight and volume of detector head compared to conventional cameras; improved spatial resolution. Output images interpreted by clinicians to assess radionuclide distribution; aids in diagnostic decision-making. Reduced detector weight potentially decreases patient risk.
Clinical Evidence
No clinical data provided; substantial equivalence based on technological characteristics and performance comparisons to predicate devices.
Technological Characteristics
Gamma camera system; utilizes scintillator and position-sensitive photomultiplier tubes (PSPMTs) for photon detection. Energy range 30-300keV. Includes signal analysis and display hardware. Standalone system.
Indications for Use
Indicated for planar imaging of radionuclide distribution in the human body for qualified medical personnel interpretation. Energy range 30-300keV. Not indicated for whole body, SPECT, or positron imaging.
Regulatory Classification
Identification
A scintillation (gamma) camera is a device intended to image the distribution of radionuclides in the body by means of a photon radiation detector. This generic type of device may include signal analysis and display equipment, patient and equipment supports, radionuclide anatomical markers, component parts, and accessories.
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Image /page/0/Picture/1 description: The image is a black and white logo for YMI. The logo is a black rectangle with the letters YMI in white. The Y is stylized with a curved tail. There is a circle in the upper right corner of the rectangle, which appears to be a hole. The rectangle is tilted slightly to the right.
# Gamma Medica" Instruments
Division of Photon Imaging, Inc.
# 510(k) SUMMARY
This 510(k) summary of safety and effectiveness information is being submitted in accordance with the requirements of SMDA 1990 and 21 CFR § 807.92.
The assigned 510(k) number is:_K973813
Bradlev E. Patt, PhD Submitted by: Regulatory Officer Gamma Medica Instruments Division of Photon Imaging, Inc. 19355 Business Center Drive, Suite 8 Northridge, CA 91324
> Telephone #: (818) 709-2468 Facsimile #: (818) 709-2464
Date Prepared: November 8, 1999
## Establishment Registration Number:
Gamma Medica Instruments, Division of Photon Imaging, Inc. is located at 19355 Business Center Drive, Suite 8, Northridge, CA 91324. Applicant has recently submitted a form FDA 2891, and is awaiting receipt of an Establishment Number.
### Classification Name:
Scintillation (Gamma) Camera, Class I 21 CFR § 892.1100 (1990)
### Common/Usual Name:
Gamma Camera
Proprietary Name: LumaGEM™ Scintillation Camera
19355 Business Center Dr.
Suite #8
Northridge, CA 91324
Tel (818) 709-2468
Fa. 18)709-2464
www.gammamedica.com
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# Gamma Medica" Instruments
Image /page/1/Picture/1 description: The image shows a logo with the letters "YMI" in white on a black, tilted rectangle. The "Y" is stylized with a curved tail. A black circle is attached to the top right corner of the rectangle, with a small white dot inside it. The logo has a simple, modern design.
Division of Photon Imaging, Inc.
# Indications for Use:
The LumaGEM™ scintillation camera is a gamma camera system, which is intended for measuring and imaging the distribution of radionuclides in the human body by means of photon detection. These images are intended to be interpreted by qualified medical personnel.
| | | Yes | No | Energy Range |
|----|------------------------------------------------------|-----|----|--------------|
| A. | Planar Imaging | X | | 30-300keV |
| B. | Whole body imaging | | X | |
| C. | Tomographic Imaging (SPECT) for non-positron imaging | | X | |
| D. | Positron coincidence imaging | | X | |
| E. | Positron non-coincidence imaging | | X | |
### Device Description:
The principles of operation and technology incorporated in the LumaGEM™ are equivalent to scintillation gamma cameras which use a combination of a scintillator with photomultiplier tubes as a photon radiation detector. The LumaGEM™ gamma camera includes signal analysis and display equipment, equipment supports and accessories.
### Substantial Equivalence Claim:
The LumaGEM™ gamma camera has the same intended use, uses the same principle of radiation detection, and has very similar performance characteristics as the predicate devices; the the ADAC S315 (Transcam), K921296, the Elscint APEX SPX-4, the DIGIRAD Notebook Imager K961104, the Siemens Orbiter and the SCINTICOR System Seventy Five (SIM-400), K885054. The main difference is that the LumaGEM™ camera uses position sensitive photomultiplier tubes, which eliminate a substantial part of the volume and weight of the predicate camera heads and improves substantially the spatial resolution. When compared to the conventional camera system, these changes will either have no effect on the patient's safety, or possibly decrease the risk to the patients, because of the reduced weight of the detector.
Suite #8
Northridge, CA 91324
Tel (818) 709-2468
Fc. 18)709-2464
ADAC S315 (Transcam Camera System) Product: Manufacturer: ADAC Laboratories 510(k) Number: K921296 05/28/92 Substantial Equivalence Date:
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Image /page/2/Picture/14 description: The image shows a logo with the letters "YMI" in white against a black, tilted square. The "Y" is stylized with a curved tail. A black circle is attached to the top right corner of the square, with a small white dot inside it. The logo has a simple, graphic design.
# Gamma Medica" Instruments
Division of Photon Imaging, Inc. Product: APEX SPX-4 Manufacturer: Elscint NM 510(k) Number: Unknown Substantial Equivalence Date: Unknown
Product: Notebook Imager (Model 2020tc) Manufacturer: Digirad Corp. 510(k) Number: K961104 Substantial Equivalence Date: 05/28/97 Substantial equivalence notification K961104 is presented as Exhibit H.
Product: Orbiter Manufacturer: Siemens Medical Systems. Inc. 510(k) Number: Unknown Substantial Equivalence Date: Unknown
Product: System Seventy Seven Manufacturer: Scintcor. Inc. 510(k) Number: K885054 Substantial Equivalence Date: 04/19/89
-end of summary-
19355 Business Center Dr.
Suite #8
Northridge, CA 91324
Tel (818) 709-2468
Fc. 18)709-2464
www.gammamedica.com
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Image /page/3/Picture/1 description: The image shows the logo for the U.S. Department of Health & Human Services (HHS). The logo features a stylized depiction of an eagle or bird-like figure with three curved lines representing its body and wings. The text "DEPARTMENT OF HEALTH & HUMAN SERVICES" is arranged in a circular fashion around the bird symbol.
Public Health Service
JAN 1 8 2000
Food and Drug Administration 9200 Corporate Boulevard Rockville MD 20850
Bradley E. Pratt, Ph.D. Regulatory Officer Gamma Medica™ Instruments Division of Photon Imaging, Inc. 19355 Business Center Dr. Suite #8 Northridge, CA 91324
Re:
K993813 LimaGEM™ Scintillation Camera Dated: November 8, 1999 Received: November 10, 1999 Regulatory class: I 21 CFR 892.1100/Procode: 90 IYX
Dear Dr. Pratt:
We have reviewed your Section 510(k) notification of intent to market the device referenced above and we 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 redassified in accordance with the provisions of the Federal Food, Drug, and Cosmetic Act (Act). You may, therefore, market the device, subject to the general controls provisions of the Act. 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.
If your device is classified (see above) into either class III (Premarket Approval), it may be subject to such additional controls. Existing major regulations affecting your device can be found in the Code of Federal Regulations, Title 21, Parts 800 to 895. A substantially equivalent determination assumes compliance with the Current Good Manufacturing Practice requirements, as set forth in the Quality System Regulation (QS) for Medical Devices: General regulation (21 CFR Part 820) and that, through periodic QS inspections, the Food and Drug Administration (FDA) will verify such assumptions. Failure to comply with the GMP regulation may result in regulatory action. In addition, FDA may publish further announcements concerning your device in the Federal Register. Please note: this response to your premarket notification submission does not affect any obligation you might have under sections 531 through 542 of the Act for devices under the Electronic Product Radiation Control provisions, or other Federal laws or regulations.
This letter will allow you to begin marketing your device as described in your 510(k) premarket notification. The FDA finding of substantial equivalence of your device to a legally marketed predicate device results in a classification for your device and thus, permits your device to proceed to the market.
If you desire specific advice for your device on our labeling regulation (21 CFR Part 801 and additionally 809.10 for in vitro diagnostic devices), please contact the Office of Compliance at (301) 594-4613. Additionally, for questions on the promotion and advertising of your device, please contact the Office of Compliance at (301) 594-4639. Also, please note the regulation entitled, "Misbranding by reference to premarket notification"(21 CFR 807.97). Other general information on your responsibilities under the Act may be obtained from the Division of Small Manufacturers Assistance at its toll-free number (800) 638-2041 or (301) 443-6597, or at its internet address "http://www.fda.gov/cdrh/dsma/dsmamain.html".
Sincerely yours,
CAPT Daniel G. Schultz, M.D. Acting Director, Division of Reproductive, Abdominal, Ear, Nose and Throat, and Radiological Devices Office of Device Evaluation Center for Devices and Radiological Health
Enclosure
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# Gamma Medica Instruments Privileged and Confidential - TRADE SECRET
510(k) Number (if known): _ 993813
Device Name: LumaGEM™ Scintillation (Gamma) Camera
INDICATIONS FOR USE:
The LumaGEM™ scintillation camera is a gamma camera system, which is intended for measuring and imaging the distribution of radionuclides in the human body by means of photon detection. These images are intended to be interpreted by qualified medical personnel.
| | | Yes | No | Energy<br>Range |
|----|---------------------------------------------------------|-----|----|-----------------|
| A. | Planar Imaging | X | | 30-300keV |
| B. | Whole body imaging | | X | |
| C. | Tomographic Imaging (SPECT) for<br>non-positron imaging | | X | |
| D. | Positron coincidence imaging | | X | |
| E. | Positron non-coincidence imaging | | X | |
(PLEASE DO NOT WRITE BELOW THIS LINE - CONTINUE ON ANOTHER PAGE IF NEEDED,
Concurrence of CDRH, Office of Device Evaluation (ODE)
Thind 4. Seppon
(Division Sign-Off)
Division of Reproductive, Abdominal, ENT,
and Radiological Devices
510(k) Number K94138
Prescription Use V (Per 21 CFR 801.109
Over-The Counter Use
(Optional Format 1-2-96)
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Learn the FDA Browser
Two short videos show you everything — or skip straight to the written tutorial if you'd rather read. You can reopen this any time from the Tutorial button in the top bar.
Part 1 — Search, results, and everyday workflows 16 min
Part 2 — Embeddings: the galaxy map 3 min
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.
Use the checkboxes above the results to narrow: SaMD keeps only software-only devices, AI / ML keeps only devices with AI.
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.
Where do you find a device's intended use without opening the PDF?
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.
How do you verify an AI chat answer on the device detail page?
Click the citation bubbles to jump to the relevant highlight in the source document.
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.
5. Side-by-side comparison
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.
6. Collections
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.
How do you save a set of selected devices for later use?
Select the rows, go to the Collections tab, and create a labeled collection (e.g., "Cobb Angle Project"). You can reload the selection anytime and carry it into the PDF viewer and other tabs that support selections.
7. Product codes and the regulations tree
Click a product code in the results to jump to it in the regulations tree — identification text, sibling product codes, and devices you can open in a PDF viewer on the right. Click a regulation number to see its identification, special controls, and related product codes. You can also search by product code or regulation number at the top of the tree. Always read the special controls if any exist for your device — it broadens your search and sharpens pre-kickoff research.
What can you do from the regulations tree view?
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.
8. Chart view
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.