Remote medical image acquisition solution: hardware construction of the entire link from endoscope to display

#Remote medical image acquisition solution: hardware construction of the entire link from endoscope to display
>Target keywords: medical imaging acquisition scheme, endoscopic image acquisition, surgical video recording system
>Topic: 3 | Date: June 12, 2026 | Author: CC-4

In 2024, a tertiary hospital's urology department wants to build a surgical video system. The information department bought a top of the line acquisition card and found that there was no image after inserting it into the endoscope host. After two days of tinkering, it was finally discovered that the signal format output by the endoscope host was DVI-D 1080P@59.94Hz (Commonly used frame rate for medical equipment), while the acquisition card only supports standard 60Hz input. The difference between two decimal places in a frame rate makes it impossible for a device costing 30000 yuan to produce a picture.
90% of the pitfalls in medical image acquisition lie in hardware integration. This article does not discuss AI assisted diagnosis or PACS system architecture (many people are talking about software level content), but focuses on how to connect, what to connect, and why to connect hardware level - this is a perspective rarely covered in competitor articles.

##1、 Panoramic hardware link for medical image acquisition
A complete medical imaging acquisition system, with hardware link length as follows:

Endoscope/Microscope/Ultrasound Host
↓ (The most crucial step is to confirm the output interface and signal format)
Video conversion/distribution (if required)
↓
Video capture card (USB/PCIe)
↓
Computer/Industrial Control Computer
∝ - → Local storage (surgical video)
└→→ Network Streaming (Remote Consultation/Surgical Demonstration)

At both ends of each arrow, there are matching requirements for five dimensions: interface type, signal format, resolution, frame rate, and color space. If any dimension does not match, the system cannot function properly.

##2、 Differences in hardware configuration among different departments
###Department 1: Digestive Endoscopy/Otolaryngology
**Typical equipment: Olympus CV-1500/290 series, Fuji VP-7000, Pentax EPK-i7010 and other endoscope hosts
*Output signal characteristics *:
-Interface: DVI-D or HDMI (DVI-D is more common for medical grade endoscopes)
-Resolution: 1080P, some high-end models support 4K
-Frame rate: 50Hz/59.94Hz (note not 60Hz!)
-Color: 10 bit color depth, P3 color gamut
Recommended combination:
|Step | Selection | Key Requirements|
|------|------|---------|
|Video Capture | USB 3.0 HDMI Capture Box (DVI to HDMI) | Must support 59.94Hz input , budget ¥ 400-800|
|Conversion cable | DVI-D to HDMI adapter | Pure digital adapter, no image loss, ¥ 20-50|
|Computer | Laptop (i5+8GB) | USB 3.0 interface is a must-have|
|Video storage | SSD ≥ 500GB | 1080P, approximately 25-50GB per hour (depending on bitrate)|
Practical points : DVI-D to HDMI is a pure digital signal, and the conversion itself does not lose image quality. But many cheap acquisition cards have non-standard EDID (Extended Display Identification Data) writing, and the endoscope host will reject the output signal when it detects an incompatible EDID. The solution is to buy an EDID emulator (¥ 50-100) and make the endoscope host think it has connected a standard monitor. **
The EM38180 high-definition acquisition solution from Shiduan Wei supports full frame rate input of 50Hz/59.94Hz/60Hz, compatible with the special frame rates of mainstream endoscope hosts, eliminating the trouble of EDID matching.

###Department 2: Laparoscopy/Surgical Microscope
*Typical equipment *: Zeiss/Leica surgical microscope, Stryker/Storz laparoscopic system
*Output signal characteristics *:
-Interface: HDMI 2.0 or 3G-SDI
-Resolution: 4K (mainstream laparoscopic) or 1080P (surgical microscope)
-Frame rate: Standard 60Hz
-Color: 10 bit, BT.2020 color gamut (4K)
Recommended combination:
|Step | Selection | Key Requirements|
|------|------|---------|
|Video capture | PCIe 4K capture card (hard coded) | 4K data volume is large, but soft coding cannot handle it|
|Loop out display | 4K surgical monitor (with DICOM preset) | Large screen monitoring in the operating room, with accurate color accuracy|
|Computer | Desktop Workstation (i7+16G+discrete graphics card) | PCIe slot+GPU hard coding capability|
|Storage | RAID 1 dual disk backup | Surgical video cannot be lost|
*Combination logic *: There are two unique requirements for the operating room scene - local large screen monitoring (zero latency)+synchronized video recording (can be reviewed afterwards). So the loop out function of the collection card is not just a 'icing on the cake' here, but a 'must-have'. The chief surgeon displays the zero delay image on the monitor, and the capture card simultaneously sends the image to the computer for recording and streaming.
**An easily overlooked detail: The color temperature of the surgical light (4000-4500K) is different from that of the standard light source (6500K). If the collection card is not color calibrated, the recorded surgical images will appear yellowish. It is recommended to perform a white balance calibration on the acquisition end - not through software post adjustment, but by setting the color temperature offset parameter in the acquisition card driver.

###Department 3: Ultrasound/Radiography
*Typical equipment *: GE/Philips/Siemens ultrasound equipment, C-arm X-ray machine
*Output signal characteristics *:
-Interface: VGA (old device), DVI-D, HDMI (new device)
-Resolution: ranging from 1024 × 768 to 1920 × 1080
-Frame rate: 30-60Hz
-Special requirement: High dynamic range - The grayscale information of ultrasound images is crucial for diagnosis
Recommended combination:
|Step | Selection | Key Requirements|
|------|------|---------|
|Video capture | USB 3.0 capture (supports RGB24 encoding) | RGB24 preserves grayscale integrity, MJPEG may lose details|
|Interface conversion | VGA to HDMI converter (if the device has an old VGA port) | Choose a model that supports resolution adaptation|
|Computer | Regular desktop/laptop | Ultrasound data volume is not large, and the configuration requirements are not high|
Why is RGB24 encoding necessary? The diagnostic information of ultrasound images is hidden in 10 bit grayscale - there are 1024 grayscale levels ranging from pure black to pure white. MJPEG encoding compresses grayscale transitions, compressing 10 bit information to 8 bits, merging adjacent grayscale levels, and potentially "swallowing" some unclear echo areas of early lesions by the encoder. RGB24 lossless or near lossless encoding is necessary to maintain diagnostic grayscale.
The H.264 hard compression scheme of Shiduan Wei supports high color depth input while ensuring compression efficiency, and can balance file size and grayscale fidelity in medical imaging scenes.

##3、 Two special technical indicators of medical imaging
###Indicator 1: Delay - the lifeline of surgical teaching
No one cares about the 100ms delay in regular live broadcasts, but in surgical teaching scenarios, remote experts guide the lead surgeon through real-time visuals. If the command 'Cut 2mm to the left' is delayed for more than 200ms, the coordination between the hands and eyes will become disjointed.
Accumulated delays in each stage:
-Endoscope host output delay: 10-30ms (device fixed value)
-Collection card encoding delay: hardware encoding 5-15ms vs software encoding 50-100ms
-Network transmission: LAN<5ms, inter provincial 30-60ms
-Decoding display: 10-20ms
The only solution for end-to-end delay control within 200ms is hard coded acquisition+wired network+hardware decoding display.
###Indicator 2: Color Calibration - Not Just 'Looks Right'
For regular video capture, 'similar colors are sufficient'. However, color deviation in medical imaging may lead to diagnostic bias - for example, slight changes in mucosal color under endoscopy are important indicators of early lesions. If the acquisition link compresses light red into grayish yellow, doctors will not be able to make accurate judgments through imaging.
*Practical calibration method *: Buy a standard color card (about ¥ 200), take a picture of the color card under the endoscope field of view, record the deviation between the collected RGB values and the standard values, and perform color matrix compensation in the acquisition card driver.

##4、 Quick reference table for different department configurations
|Department | Typical Interface | Resolution | Recommended Collection Method | Storage Requirements | Key Considerations|
|------|---------|--------|------------|---------|---------|
|Digestive endoscopy | DVI-D | 1080P | USB 3.0 acquisition box | 25GB/hour | 59.94Hz frame rate compatible|
|Laparoscopy | HDMI 2.0 | 4K | PCIe hard coded card | 100GB/hour | Loop out zero latency monitoring|
|Surgical microscope | HDMI | 1080P/4K | USB 3.0 or PCIe | 25-100GB/hour | Color temperature offset calibration|
|Ultrasound | VGA/DVI | 1024 × 768+| USB 3.0+RGB24 | 15GB/hour | Grayscale fidelity|
|Dental endoscope | HDMI/USB | 1080P | USB 3.0 capture box | 15GB/hour | Oral light source is yellowish|
|Ear, nose, and throat | DVI-D/HDMI | 1080P | USB 3.0 capture box | 20GB/hour | Small aperture lens image quality limit|

##5、 Practical steps for hardware construction

Step 1: Confirm the output interface and signal format of the imaging device (camera retention interface panel)
Step 2: Purchase interface conversion cable (if it can be directly connected, do not convert; if it can be digital, do not simulate)
Step 3: Confirm that the acquisition card supports the target frame rate and color space
Step 4: Connect the device and use the built-in tool on the acquisition card to confirm the signal lock (check EDID if there is no screen)
Step 5: End to end latency testing (using a millisecond timer to measure the full link latency and confirm it is within the target range)
Step 6: Color calibration (standard color card+driver compensation)
Step 7: Storage Configuration (Surgical Video Dual Backup, Non Surgical Video Single Disk)
Step 8: Network streaming test (measured upstream bandwidth+encoding parameters)

Every time you go to the hospital for deployment, carrying this list through can avoid 80% of on-site pitfalls.

Shiduan Wei Technology provides medical image acquisition modules and industrial camera solutions, supporting signal acquisition for various types of medical equipment such as endoscopes, microscopes, and ultrasound. If you need technical support for medical grade image acquisition solutions, please visit videowellwork.com