Prostate Biopsy Image Registration for Repeat Targeting
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Solution Overview
Problem
Current prostate biopsy procedures lack accurate visualization and targeting of cancerous tissues due to unreliable ultrasound-visualized anatomical landmarks and the inability to efficiently transfer and utilize biopsy findings across repeat procedures, leading to repeated sampling of benign regions and potential missed cancerous areas.
Innovation Solution
A system that registers and maps reference images from high-resolution imaging modalities like MRI with real-time guidance images from modalities like ultrasound, allowing for precise targeting and tracking of biopsy locations across procedures, enabling improved visualization and planning for repeat interventional procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If ultrasound imaging is used for real-time guidance during prostate biopsy, then real-time visualization and ease of operation are improved, but image resolution and lesion visualization accuracy deteriorate
Solution Approach 1:
The system merges ultrasound images with MRI images through image registration, combining the real-time guidance capability of ultrasound with the high lesion visualization accuracy of MRI. The registered images are displayed in a composite view that shows both modalities simultaneously, allowing the operator to benefit from both imaging modalities' strengths.
Solution Approach 2:
The system uses an image registration module as an intermediary that transforms and aligns MRI images into the ultrasound coordinate system. This registered MRI image serves as a mediator that provides high-resolution anatomical and lesion information overlaid on the real-time ultrasound guidance, enabling accurate lesion targeting without sacrificing real-time visualization.
2Measurement precision
If MRI imaging is used for high-resolution lesion visualization, then measurement precision is improved, but real-time guidance capability and ease of operation deteriorate
Solution Approach 1:
The system performs MRI imaging and image registration in advance before the actual biopsy procedure. The MRI images are pre-processed, segmented to identify lesions, and registered to the ultrasound coordinate system beforehand. This preliminary preparation allows the high-resolution MRI data to be readily available as guidance during the real-time ultrasound-guided biopsy without requiring the MRI scanner to be present during the procedure.
3Ease of operation
If repeat biopsy procedures are performed with random sampling, then ease of operation is maintained, but diagnostic accuracy and productivity deteriorate due to repeated sampling of benign regions
Solution Approach 1:
The system incorporates feedback from previous biopsy procedures by storing and retrieving information about previously sampled locations and their results. The registered MRI images show the locations of prior biopsies, allowing the operator to see which areas have already been sampled and which areas with suspicious lesions remain unsampled. This feedback mechanism guides the planning of subsequent biopsy targets to avoid re-sampling benign areas and to focus on unsampled suspicious regions.
Solution Approach 2:
The system performs preliminary planning of biopsy targets by analyzing registered MRI images from previous procedures before conducting the repeat biopsy. The operator can pre-identify suspicious lesions that were not previously sampled by reviewing the composite registered images, allowing for deliberate targeting of specific areas of concern rather than random sampling. This preliminary target identification improves diagnostic efficiency by focusing the repeat biopsy on the most suspicious unsampled regions.
Data Source
AI summary
A system for planning and performing a repeat interventional procedure is provided which includes a registration device and an image generation device which map current targets in a reference image for a first interventional procedure to at least one guidance image acquired from a different imaging modality. Biopsy locations are recorded to the guidance images during the first interventional procedure and the biopsy locations are mapped to the reference image to provide a planning image for use in a subsequent interventional procedure on the patient. In a subsequent interventional procedure, the prior planning image (124) may be registered to a current reference image and the prior biopsy locations and prior and current targets are mapped to a guidance image acquired from a different imaging modality. Biopsy locations are then mapped to the guidance image and mapped back to the current reference image.