DEXELA DEX TOP MAMMOGRAPHY WORKSTATION, MODEL MAMWKVI
Applicant
Dexela, Ltd.
Product Code
LLZ · Radiology
Decision Date
Apr 22, 2008
Decision
SESE
Submission Type
Traditional
Regulation
21 CFR 892.2050
Device Class
Class 2
Attributes
Software as a Medical Device
Indications for Use
The DexTop Mammography Workstation is a mammography review workstation software package, which provides very high performance viewing, processing and analysis of multimodality two and three dimensional, as well as planar, medical image data. The DexTop Workstation is designed to assist the radiologist in conducting screening and primary diagnosis through flexible, fast and efficient image hanging and processing of multimodality soft-copy images with special emphasis and optimization for mammography. When interpreted by a skilled physician, this software provides information that may be useful in screening and diagnosis. However, the final judgment must rely on the knowledge and skill of the physician.
Device Story
DexTop Mammography Workstation is a software-based PACS review system running on a high-end PC. It ingests digital medical images (MG, MR, CR, US) via DICOM 3.0/TCP/IP from hospital PACS, diagnostic systems, or local media. The system provides tools for image hanging, viewing, and manipulation (window/level, zoom, pan, tiling, CLAHE, unsharp mask). It supports multi-monitor configurations (typically two high-resolution 5MP monitors for mammography). Operated by radiologists in clinical settings, the software assists in screening and primary diagnosis. It does not perform proprietary image processing of FFDM manufacturers, maintaining full-fidelity DICOM 'For Presentation' images. The system uses a centralized configuration store for satellite workstations. Output is visual display for physician interpretation; clinical decisions remain the responsibility of the physician.
Clinical Evidence
Bench testing only. No clinical data provided. The device underwent system requirements testing according to a defined Software Testing Strategy and Software Requirements Test Specification Document. Development followed a formal design control process including product risk analysis and architecture documentation.
Technological Characteristics
Software-based PACS running on 64-bit Windows XP Professional. Hardware requirements: multi-core processor, 2GB RAM, 80GB storage, HIPAA-approved monitors (min 5MP for mammography). Connectivity: 10/100/1000 Base-T Ethernet, DICOM 3.0, TCP/IP. Image processing: CLAHE, unsharp mask, window/level, LUT adjustments. Architecture: Centralized configuration store with satellite workstations.
Indications for Use
Indicated for use by radiologists for screening and primary diagnosis of multimodality medical images (MG, MR, CR, US), with optimization for mammography. Requires interpretation by a skilled physician. Lossy compressed mammography images and digitized film screen images are contraindicated for primary diagnosis.
Regulatory Classification
Identification
A medical image management and processing system is a device that provides one or more capabilities relating to the review and digital processing of medical images for the purposes of interpretation by a trained practitioner of disease detection, diagnosis, or patient management. The software components may provide advanced or complex image processing functions for image manipulation, enhancement, or quantification that are intended for use in the interpretation and analysis of medical images. Advanced image manipulation functions may include image segmentation, multimodality image registration, or 3D visualization. Complex quantitative functions may include semi-automated measurements or time-series measurements.
Special Controls
*Classification.* Class II (special controls; voluntary standards—Digital Imaging and Communications in Medicine (DICOM) Std., Joint Photographic Experts Group (JPEG) Std., Society of Motion Picture and Television Engineers (SMPTE) Test Pattern).
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### 5 510(k) Summary of Safety and Effectiveness
Ko80351
| SUBMITTER: | Dexela Limited |
|----------------------|------------------------------------------------------------|
| CONTACT PERSON: | Michael Henry |
| | APR 22 2008 |
| DATE PREPARED: | 31 January, 2008 |
| DEVICE TRADE NAME: | DexTop Mammography Workstation |
| COMMON NAME: | DexTop Mammography Workstation |
| CLASSIFICATION NAME: | Picture Archiving and Communication System |
| PREDICATE DEVICE(S): | General Electric Medical Systems: Seno Advantage (K033400) |
#### DEVICE DESCRIPTION:
The DexTop Mammography Workstation is a software product, which runs on a high end personal computer, for the purpose of non-invasive multi-modality review. It provides very high performance viewing, processing and analysis of multimodality two and three dimensional, as well as planar medical image data.
The DexTop Mammography Workstation receives digital image data from various sources including a variety of diagnostic imaging systems, Hospital PACS, Electronic media and local file systems.
The architecture of the DexTop Workstation means that it can be deployed as a central base station with satellite workstations all using the same user configuration store and image data.
The Dexela DexTop Mammography Workstation supports the following image network communications:
- Standard 10/100/1000 Base-T Ethernet protocols .
- . DICOM 3.0 Storage SCP and Query/Retrieve SCU.
- . TCP/IP network layer
The hardware configuration used with the software typically will include a PC, a single standard color monitor, a multi-function keypad (for increased productivity), and two high resolution monitors for mammographic Image review.
See the following table.
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| Component | Quantity |
|----------------------------------------------------------------------------------|-----------------------------------|
| SYSTEM: Multi-core (>2) 64-bit processor | 1 |
| Memory: Minimum 2GB RAM | NA |
| STORAGE: DVD Drive SONY DDU1615 or equivalent | 1 |
| RAM: Minimum 80 GB (MAXTOR ATLAS SCSI drive or equiv) | NA |
| DISPLAYS: Any HIPAA approved display monitors | 1 or 2 depending on configuration |
| PERIPHERALS: Standard keyboard<br>Standard mouse<br>X-KEYS SE USB - LCD keypad | 1 each |
| SOFTWARE: Windows XP Professional X64<br>Dexela Mammography Workstation Software | 1 each |
#### INDICATION FOR USE:
The DexTop Mammography Workstation is a mammography review workstation software package, which provides very high performance viewing, processing and analysis of multimodality two and three dimensional, as well as planar, medical image data.
The DexTop Workstation is designed to assist the radiologist in conducting screening and primary diagnosis through flexible, fast and efficient image hanging and processing of multimodality softcopy images with special emphasis and optimization for mammography.
When interpreted by a skilled physician, this software provides information that may be useful in screening and diagnosis. However, the final judgment must rely on the knowledge and skill of the physician.
| Hardware | |
|--------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| 64 bit Windows Operating System | More memory for larger data sets and increase<br>speed of workflow |
| Multi-core processor | Makes full use of new multi core CPUs to<br>maximize throughput |
| Remote workstation configuration | Multiple workstations can view the same data. |
| Easy to use shortcut keypad | Shortcut keys to often used functions are<br>presented on a separate keypad for ease of use |
| Communications | |
| DICOM | DICOM compliant communications |
| Software | |
| Modalities | MG,MR,CR,US |
| Multi-vendor imaging | Fully IHE and DICOM compliant image display<br>allows any vendor image to be displayed<br>correctly |
| Window centre and width adjustment | Window centre and width can be freely adjusted |
| Hardware | |
| | for any image maintaining the predefined curve<br>if it exists |
| Use of imbedded VOI LUTs | Correct implementation of the DICOM LUTS<br>imbedded in the image file, including the ability<br>for the user to adjust the image maintain the |
| Linear and Sigmoid LUTs | same curve<br>Switch between the use of a linear or a sigmoid |
| Pull-scale function | curve for the display of gray scale images<br>Function allowing the user to focus on a specific<br>area with regard to window centre and width |
| User specific window center and width | The system can remember the individual's<br>preference for an image with regard to changes<br>made to its default window centre and width |
| Highly flexible patient and technical<br>information display | The user can specify which pieces of patient and<br>technical information should appear on which<br>screen |
| XML based annotation | Allows the radiologist to annotate the images in<br>a very flexible way. The annotation can be<br>hidden and deleted as required |
| Flip, Zoom, Invert and Pan | The images can be manipulated on screen in all<br>the usual ways |
| Tiling | Images series or planar images can be tiled to<br>the screen allowing some or all of the frames to<br>viewed at the same time. |
| Shutter-View | A type of shutter view of the image where two<br>synchronized images have a mask overlaid so<br>only the same small portion of each image is<br>visible. |
| 1:1 view | Display of the image data at one pixel per image<br>data. |
| Life-size view | Display of the image at life size |
| Magnifying glass | A zoomed in portion of the image at the current<br>cursor position |
| Hot lamp / Bright Light | A portion of the image is displayed as if a<br>brighter light had been applied to that area of<br>the screen. |
| CLAHE and Un-sharp Mask | Image processing techniques can be applied to<br>sharpen and equalize the images |
| Highly configurable hanging | Hanging protocols are designed per user with<br>unlimited categories and limitless flexibility with<br>respect to screen use and positioning |
| Smart-Merge Protocol | Specific technology that brings together user<br>preferences from different aspects of film type<br>and screen use and combines them to form a<br>new hanging from images that are only loosely<br>specified. |
| DICOM printing | DICOM printing |
| Data export | Export data to CD or for presentations |
## TECHNOLOGICAL CHARACTERISTICS:
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#### NON-CLINICAL REQUIREMENTS TEST:
The non-clinical testing for the DexTop Workstation includes performance of system requirements testing according to the Software Testing Strategy and following the test cases as defined in the Software Requirements Test Specification Document.
#### CONCLUSIONS:
Software Development for the DexTop workstation has been performed in accordance with the Software Development Plan and following the guidance of the Dexela Design and Development Procedures, and which includes, in addition to other documents, a Product Risk Analysis, Software Requirements, Design and Development Plan, detailed Architecture documents , Testing Strategy, and Software Requirements Test Specification. Therefore Dexela is confident that the system as developed will perform according to the specifications detailed in the User Requirements Specification and System Requirements Specification.
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Image /page/4/Picture/1 description: The image shows the logo for the U.S. Department of Health & Human Services. The logo consists of a stylized eagle with three stripes representing the three branches of government. The eagle is positioned to the right of the text "DEPARTMENT OF HEALTH & HUMAN SERVICES - USA", which is arranged in a circular fashion around the logo.
#### Public Health Service
Food and Drug Administration 9200 Corporate Boulevard Rockville MD 20850
# APR 22 2008
Dexela, Ltd. % Mr. Barry Sall, RAC Principal Consultant Parexel Consulting 200 West St. WALTHAM MA 02451
Re: K080351
Trade/Device Name: Dexela DexTop Mammography Workstation Regulation Number: 21 CFR 892.2050 Regulation Name: Picture archiving and communications system Regulatory Class: II Product Code: LLZ Dated: March 28, 2008 Received: March 31, 2008
Dear Mr. Sall:
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. 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 II (Special Controls) or class III (PMA), 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, Rarts 800 to 898. In addition, FDA may publish further announcements concerning your device in the Federal Register.
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Page 2
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 801); good manufacturing practice requirements as set forth in the quality systems (QS) regulation (21 CFR Part 820); and if applicable, the electronic product radiation control provisions (Sections 531-542 of the Act); 21 CFR 1000-1050.
This letter will allow you to begin marketing your device as described in your Section 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), please contact the Center for Devices and Radiological Health's (CDRH's) Office of Compliance at one of the following numbers, based on the regulation number at the top of this letter,
| 21 CFR 876.xxxx | (Gastroenterology/Renal/Urology) | 240-276-0115 |
|-----------------|----------------------------------|--------------|
| 21 CFR 884.xxxx | (Obstetrics/Gynecology) | 240-276-0115 |
| 21 CFR 892.xxxx | (Radiology) | 240-276-0120 |
| Other | | 240-276-0100 |
Also, please note the regulation entitled, "Misbranding by reference to premarket notification" (21CFR Part 807.97). For questions regarding postmarket surveillance, please contact CDRH's Office of Surveillance and Biometric's (OSB's) Division of Postmarket Surveillance at 240-276-3474. For questions regarding the reporting of device adverse events (Medical Device Reporting (MDR)), please contact the Division of Surveillance Systems at 240-276-3464. You may obtain other general information on your responsibilities under the Act from the Division of Small Manufacturers, International and Consumer Assistance at its toll-free number (800) 638-2041 or (240) 276-3150 or at its Internet address http://www.fda.gov/cdrb/industry/support/index.html.
Sincerely yours,
Nancy C. Brogdon
Nancy C. Brogdon Director, Division of Reproductive, Abdominal, and Radiological Devices Office of Device Evaluation Center for Devices and Radiological Health
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510(k) Number (if known): K080351
#### Device Name: Dexela DexTop Mammography Workstation
The DexTop Mammography Workstation is a mammography review workstation software package, which provides very high performance viewing, processing and analysis of multimodality two and three dimensional, as well as planar, medical image data.
The DexTop Workstation is designed to assist the radiologist in conducting screening and primary diagnosis through flexible, fast and efficient image hanging and processing of multimodality soft-copy images with special emphasis and optimization for mammography.
Dexela DexTop Mammography Workstation will display the full fidelity DICOM image in a non-compressed format. Lossy compressed mammography images and digitized film screen images must not be used for the purpose of primary diagnosis. Mammographic images may only be interpreted using an FDA approved monitor that offers at least 5 megapixel resolution and meets other technical specifications reviewed and accepted by the FDA
When interpreted by a skilled physician, this software provides information that may be useful in screening and diagnosis. However, the final judgment must rely on the knowledge and skill of the physician.
The device will display only DICOM "For Presentation" images for primary image diagnosis. The device does not perform any image processing (except simple manipulation such as gray scale changes by window level and window width) of the proprietary image processing algorithm of the FFDM manufacturers.
Prescription Use _____________________________________________________________________________________________________________________________________________________________ (Part 21 CFR 801 Subpart D)
Over-the-Counter Use (21 CFR 807 Subpart C) AND/OR
(PLEASE DO NOT WRITE BELOW THIS LINE - CONTINUE ON ANOTHER PAGE IF NEEDED)
Concurrence of CDRH, Office of Device Evaluation (ODE)
(Division Sign-Off)
Division of Reproductive, Abdominal and
Radiological Devices
510(k) Number K080351
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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 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).
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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.
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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.
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Reading rule for every project: how many summaries do you read in full?
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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.
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Click "Show Chart" and segment by Regulation Number. Clicking a regulation takes you to the regulations tree.
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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.
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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.