Data Characteristics for This Category
Imaging device data for clinical trial pre-screening primarily comes from medical images (e.g., CT, MRI, X-ray, ultrasound) and associated reports, measurement data, and patient clinical information. Images are typically stored in DICOM format. Reports are structured or semi-structured text, including diagnostic conclusions, lesion descriptions, measurements (e.g., tumor size, vessel diameter), and radiologist professional judgments. Data update frequency depends on the clinical trial protocol, potentially weekly, monthly, or quarterly. Fields and units are highly standardized. For example, lesion size is often in millimeters (mm), density in Hounsfield Units (HU), and anatomical location information is usually present.
Constraints Imposed by These Characteristics on "Reference and Traceability"
The standardized format of imaging data (DICOM) and structured reports facilitate referencing and traceability. However, they also introduce constraints such as large data volumes and complex parsing. Image information cannot be directly cited as text. Traceability must point to the original DICOM file or its key metadata. Specialized terminology and measurement units in reports require high-precision recognition from text processing models to avoid ambiguity. The update frequency of clinical trials determines the synchronization requirements for knowledge base content. Any delay can affect pre-screening accuracy. Furthermore, sensitive information in imaging reports requires the reference mechanism to support desensitization or access control when displaying original text, complying with medical data privacy regulations.
Configuration Settings
| Configuration Item | Recommended Value | Rationale |
|---|---|---|
maxContext | 3000-4000 characters | Accommodates detailed descriptions and multiple measurements in imaging reports |
Recall Count | Top 10 entries | Ensures coverage of multiple relevant imaging reports and key image metadata |
Similarity Threshold | 0.75-0.85 | Balances recall and precision, filtering irrelevant imaging report snippets |
Reranked Return Count | 5 entries | Focuses on the most relevant report sections, reducing interference from irrelevant information |
Segment Length | 800-1200 characters | Retains complete descriptions of individual lesions or key conclusions, avoiding semantic fragmentation |
PARSE_FILE_TIMEOUT_SECONDS | 180-300 seconds | Handles parsing large DICOM files and extracting reports |
Three Common Mistakes
- The reference results contain a large amount of irrelevant imaging report content. This is because the
Similarity Thresholdis set too low, leading to the recall of non-core diagnostic information. - The output reference source links cannot point to specific image regions or measurement values. This is because fine-grained metadata was not extracted during original image data parsing, or the knowledge base index granularity is too coarse.
- Model responses cite outdated or corrected imaging report data. This is because the knowledge base content update mechanism failed to synchronize clinical trial data changes in a timely manner.
How to Confirm Proper Configuration
- For typical pre-screening questions, check whether the sources cited in the model's answer can be traced back to specific imaging report sections or DICOM metadata fields.
- Verify that all recalled reference entries are highly relevant to the question. Observe the performance of the
Similarity Thresholdunder different queries to confirm its filtering effect. - Regularly simulate data update scenarios. After the knowledge base index updates, check whether the reference sources accurately reflect the latest version of imaging report information.
- Compare with original reports to verify consistency of specialized terminology, measurement units, and numerical values in the cited content.
Note: The values provided are common starting points. Measure them against your own samples.
Question material comes from public community discussions. Configuration values are common starting points and should be measured against your own samples. Verified on 2026-09-21.