K992698 · Stentor, Inc. · LMD · Oct 25, 1999 · Radiology
Device Facts
Record ID
K992698
Device Name
STENTOR, PAGEVIEW
Applicant
Stentor, Inc.
Product Code
LMD · Radiology
Decision Date
Oct 25, 1999
Decision
SESE
Submission Type
Traditional
Regulation
21 CFR 892.2020
Device Class
Class 1
Attributes
Software as a Medical Device
Indications for Use
Stentor PageView is a digital medical imaging distribution and display system to be used for both primary diagnosis and efficient distribution of medical images within the healthcare enterprise. It operates on the conventional TCP/IP internetworking infrastructure available in most healthcare organizations, and it uses commercially available computer platforms (Intel Pentium-based) and operating systems (Microsoft Windows NT, Windows 95, and Windows 98). The system does not permanently store or produce original medical images.
Device Story
Stentor PageView is a teleradiology software system for distributing and displaying digital medical images. It receives DICOM 3.0 images from remote servers via TCP/IP networks; converts images into a web-browser compatible wavelet format; and displays them on standard monitors using Intel Pentium-based PCs running Windows NT, 95, or 98. The system provides tools for primary diagnosis, including image measurement, cine loops, comparison modes, annotation, and window/level controls. It is intended for use by physicians and healthcare staff within and outside radiology departments. The device does not permanently store or generate original images; it functions as a viewing interface to facilitate clinical decision-making by providing efficient access to diagnostic-quality images across the healthcare enterprise.
Clinical Evidence
Bench testing only. The software underwent extensive validation by programmers, non-programmers, quality control staff, and potential customers to ensure performance and reliability. No clinical studies were required or performed.
Technological Characteristics
Software-based teleradiology system; operates on standard Intel Pentium-based PCs; OS: Windows NT, 95, 98; Network: TCP/IP; Input: DICOM 3.0; Compression: Wavelet; Display: Standard monitors; Software class: Minor level of concern; Connectivity: Networked client-server architecture.
Indications for Use
Indicated for use by healthcare professionals, including physicians, medical technologists, and hospital IT staff, for the primary diagnosis and distribution of digital medical images within a healthcare enterprise.
Regulatory Classification
Identification
A medical image communications device provides electronic transfer of medical image data between medical devices. It may include a physical communications medium, modems, and interfaces. It may provide simple image review software functionality for medical image processing and manipulation, such as grayscale window and level, zoom and pan, user delineated geometric measurements, compression, or user added image annotations. The device does not perform advanced image processing or complex quantitative functions. This does not include electronic transfer of medical image software functions.
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OCT 25 1999
Image /page/0/Picture/1 description: The image shows a sequence of handwritten characters and numbers. The sequence starts with the letter 'K', followed by the number '99', then '26', and ends with '98'. The handwriting appears somewhat cursive and the numbers are written closely together.
# 510(k) SUMMARY
In accordance with the provisions of the Safe Medical Device Act of 1990, m accordance with the provisional of safety and effectiveness information regarding the PageView software.
- Company Identification 1.1
Stentor, Inc. 385 Oyster Point Blvd. Suite 8B South San Francisco, CA 94080 Tel: (650) 866-4100 Fax: (650) 866-4197
- Official Correspondent 1.2
Gary J. Allsebrook Regulatory Management Services 16303 Panoramic Way San Leandro, CA, USA, 94578-1116 (510) 276-2648 Tel: (510) 276-3559 Fax: Email: regman1@home.com
- Date of Submission 1.3
August 10, 1999
- 1.4 Device Name
Classification Name: Common/Usual Name: Proprietary Name:
PACS Teleradiology System Stentor PageView
- Substantial Equivalence 1.5
The PageView software is substantially equivalent to the Mitra, Exhibit
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(K982769) and the Dome Imaging Systems, PACScache (K983815).
#### 1.6 Device Description and Intended Use
Stentor PageView is a digital medical imaging distribution and display system to be used for both primary diagnosis and efficient distribution of medical images within the healthcare enterprise. It operates on the conventional TCP/IP internetworking infrastructure available in most healthcare organizations, and it uses commercially available computer platforms (Intel Pentium-based) and operating systems (Microsoft Windows NT, Windows 95, and Windows 98). The system does not permanently store or produce original medical images. For further information about the basic architecture of the system, please refer to the Stentor System Design Document Summary.
Intended Users: The PageView components are always integrated into client applications. These PageView client applications are designed to be used by people who are involved in healthcare delivery. This includes physicians, medical technologists, administrative staffs, hospital information technology staffs, and people who will support and service the PageView products.
#### 1.7 Software Development
Stentor certifies that the PageView software is designed, developed, tested and validated according to written procedures. These procedures identify individuals within the organization responsible for developing and approving product specifications, coding and testing, validation testing and field maintenance. The software used in this product is used to convert DICOM images to formats that can be displayed both within web browsers as well as stand-alone applications.
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#### 1.8 Safety and Effectiveness
## General Safety and Effectiveness Concerns:
The device labeling contains instructions for use and indications for use.
The hardware components specified (but not supplied) are all "off the shelf" computer components.
## Validation and Effectiveness:
Extensive testing of the software package has been performed by programmers, by non-programmers, quality control staff, and by potential customers.
## Substantial Equivalence:
The PageView software is a software package used to receive DICOM images, convert them to a web-browser compatible format, and to transfer those converted images to a viewing applet.
PageView is substantially equivalent to the Mitra Exhibit product, in that it receives DICOM images, converts them to wavelet format and displays them within a web browser. The intended use and technological characteristics of the system are virtually identical to Mitra Exhibit (K982769)or the Dome Imaging Systems PACScache (K983815). Any differences between the PageView software and the equivalent devices have no significant influence on safety or effectiveness.
It is our conclusion that there is no software component in the PageView product or hardware component which would be used in conjunction with the PageView product that we know of whose failure or latent design flaw would be expected to result in death or injury to a patient. Thus the "Level of Concern" of the Stentor PageView product is "minor".
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### 1.9 Substantial Equivalence Chart
| Product Name | Mitra-Exhibit<br>(K982769) | Dome Imaging Systems<br>PACScache<br>(K983815) | Stentor-PageView<br>(this submission) |
|---------------------------------------------------|----------------------------|------------------------------------------------|---------------------------------------|
| Print to Paper Capability | Yes | Yes | Yes |
| Graphical Ul | Yes | Yes | Yes |
| Windows O.S. - Client | Yes | Yes | Yes |
| Uses Standard. Monitor | Yes | Yes | Yes |
| Scales Image to Display. | Yes | Yes | Yes |
| Image Input | DICOM 3.0 | DICOM 3.0 | DICOM 3.0 |
| Images stored on remote NT<br>server | Yes | Yes | Yes |
| Network Protocol | TCP-IP | TCP-IP | TCP-IP |
| Compression | Wavelet | J-Peg | Wavelet |
| Annotation | Yes | Yes | ત્ત્વ સ્ક્રિક |
| Image Measurement | Yes | No | Yes |
| Cine tool | Yes | Yes | Yes |
| Comparison Mode | Yes | Yes | Yes |
| Review Report from RIS | Yes | Yes | Yes |
| Designed for Use Inside &<br>Outside of Radiology | Yes | Yes | Yes |
| Flip / Rotate of Images | Yes | Yes | Yes |
| User Log In | Yes | Yes | Yes |
| Multiple Layout Options | Yes | Yes | Yes |
| WW/WL control & Pre-sets | Yes | Yes | Yes |
| Patient & Study Browser | Yes | Yes | Yes |
.
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Image /page/4/Picture/1 description: The image shows the logo for the Department of Health & Human Services - USA. The logo is circular and contains the text "DEPARTMENT OF HEALTH & WOMAN SERVICES - USA" around the perimeter. Inside the circle is a stylized image of an eagle.
Food and Drug Administration 9200 Corporate Boulevard Rockville MD 20850
OCT 2 5 1999
Stentor, Inc. Gary Allesbrook C/o Regulatory Management Services 16303 Panoramic Way San Leandro, California 94578-1116
RE:
K992698 Stentor PageView Teleradiology System Dated: August 10, 1999 Received: August 11, 1999 Regulatory Class: I 21 CFR 892.2020/Procode: 90 LMD
Dear Mr. Allesbrook:
We have reviewed your Section 510(k) notification of intent to market the device referenced above and we have have have have have We have reviewed your Section 510(i) houlder of the indications to use stated in the enclosure) to legally
determined the device is substantially equivalent for the enclosur determined the device is substant for the more processor of the enatorent date of the enational date of the marketed predicate devices marked in melse phone of this novel of on one of the provisions of the provisions of the provisions of the provisions of the negeral con Medical Device Amendments, or to devices that nave been receives market the do the general control.
Federal Food, Dog, and Cosmetic Act (Act). Your may, therefore, market th Federal Food, Drug, and Cosmetic Act (Ac). Tou may, the Act are activents for annual registration and cregistration, include provisions of the Act. The general controls provisions of the PRS mades of can be adulteration.
devices, good manufacturing practice, labeling, and prohibitions against misbr
lf your device is classified (see above) into either class III (Special Controls) or dass III (Premarket Approval), it may lf your device is classified (see above) into ether class in (rehearm (result in the contral) (e contract in the contraction in the comment in end be subject to such additional controls. Existing major regulation assumes ompliance with
Federal Regulations, Title 21, Parts 800 to 85. A substantially equivation Regulat Federal Regulations, Title 21, Factice requirements, as set forth in Custimanters (GS) for States
the Current Good Manufacturing Practice requirements, as set forth in the Fo the Current Good Manufacturing Pracice requirements, as set of the Crising of Sinnesgiations, the Frood and Medical Devices: General regulations Failure of the Conqly with the County with the Centrely in the Pesult in
Drug Administration (FDA) will verify such assumptions. Failu Drug Administration (FDA) will venty such assumply on the che vine ring var device in the Eederal
regulatory action. In addition, FDA may publish further announcering your o regulatory action. In addition, FDA may publish untitler and occisen dregondry of affect any obligation you
Register. Please note: this response to your premarket notifica Register. Please note: this response to your prematics now and 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 for This letter will allow you to begin marketing your device an your of your broad. In a classified in a classified in a classification for your device and thus, permits your device to proceed to the market.
If you desire specific advice for your labeling regulation (21 CFR Part 801 and additionally for guestions on lf you desire specific advice in your device on on labelling legaler (21) 554-413. Additionally, for questions on
vitro diagnostic devices), please contact the Office of Co vitto diagnostic devices), please contact the Unice of Corrise of Compliance at (301) 594-4639. Also,
the promotion and advertising of your device, please contact the Offic the promotion and advertising of your eetch, pease continues on online to t (21 - 1). Other .
please note the regulation entitled, "Mistranding by reference to britison of S please note the regulation entilled, "Misting of reletice to prehided from the Division of Small Manufacturers
general information on your responsibilities under the Act . (1 general information on your responsibilities and the Act May 25 Stainternet address "http://www.fda.gov/cdrh/dsma/dsmamain.html".
Sincerely yours,
APT 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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Page 1 of 1
K992698 510(k) Number (if known):
Stentor, PageView Device Name:
Indications For Use:
Stentor PageView is a digital medical imaging distribution and display system to be used for both primary diagnosis and efficient distribution of medical images within the healthcare enterprise. It operates on the conventional TCP/IP internetworking infrastructure available in most healthcare organizations, and it uses commercially available computer platforms (Intel Pentium-based) and operating systems (Microsoft Windows NT, Windows 95, and Windows 98). The system does not permanently store or produce original medical images.
### (PLEASE DO NOT WRITE BELOW THIS LINE - CONTINUE ON ANOTHER PAGE IF NEEDED)
Concurrence of CDRH, Office of Device Evaluation (ODE)
OR
Prescription Use
(Per 21 CFR 901.109)
Over-the-Counter Use
Verid C. Sgem
(Division Sign-Off)
(**Optional Format 1-2-96**)
Division of Reproductive, Abdominal, ENT,
and Radiological Devices
510(k) Number: K992145
Medical Devices
510(k) Number K992645
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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.
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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.
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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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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.
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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.
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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.