Dual-Detector MBI Lesion Depth Estimation for Biopsy Guidance
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Solution Overview
Problem
Current molecular breast imaging (MBI) systems lack an integrated method for accurate lesion depth determination and biopsy guidance, relying on separate imaging systems like ultrasound, which increases false positives and complicates lesion evaluation.
Innovation Solution
An MBI system with two moveable detector heads that determine lesion depth by measuring system resolution as a function of depth and distance between detectors, using a processor to calculate lesion depth based on detector resolutions and detector head positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If MBI system uses single detector head, then device complexity is reduced, but lesion depth determination capability is lost
Solution Approach 1:
The imaging system is segmented into two separate detector heads that can be positioned at different locations relative to the breast. Each detector head independently captures gamma ray emissions from radiopharmaceuticals, and the processor compares images from both detectors to calculate lesion depth based on the geometric relationship between the two detection planes.
Solution Approach 2:
The system transitions from single-plane 2D imaging to three-dimensional lesion localization by adding a second detector head. This creates a stereo-imaging geometry where the spatial relationship between two detection planes provides depth information, effectively adding a dimensional component to the imaging system.
2Measurement precision
If MBI system integrates depth determination, then biopsy guidance precision is improved, but device complexity increases
Solution Approach 1:
The dual-detector MBI system serves multiple functions: it performs standard molecular breast imaging to detect lesions and simultaneously provides three-dimensional depth determination for biopsy guidance. The same detector heads and processing system used for lesion detection are also used to calculate depth information, making the system multi-functional without requiring separate dedicated equipment.
Solution Approach 2:
The MBI system determines lesion depth using its own imaging data and processing capabilities, without requiring external ultrasound or other separate imaging systems. The processor automatically calculates depth based on the geometric relationship between the two detector heads and the relative positioning of lesions in their respective image planes, making the system self-sufficient for depth determination.
3Measurement precision
If separate ultrasound system is used for depth determination, then lesion depth measurement is available, but false positive rate increases
Solution Approach 1:
The system merges anatomical imaging from the dual-detector MBI system with functional molecular imaging data. By combining the structural information from two detector planes with the metabolic activity information from radiopharmaceutical uptake, the system provides both depth determination and functional characterization in a single integrated approach, reducing reliance on separate ultrasound examinations.
Solution Approach 2:
The processor acts as an intermediary that automatically calculates lesion depth based on the geometric relationship between two detector images, eliminating the need for manual measurement techniques. This automated calculation reduces human error and subjectivity in depth determination, providing more reliable and consistent measurements compared to manual ultrasound-based methods.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Provides accurate lesion depth determination and biopsy guidance, reducing false positives by integrating depth calculation into the MBI system without additional imaging time or dose, enhancing lesion detection and biopsy precision.
Implementation Method 1
radiation emitted by single-photon radiopharmaceutical(s) (for example, Tc-99m sestamibi) is detected after collimation
Data Source
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AI summary
Systems and methods are provided for lesion depth determination in molecular breast imaging. The depth of a lesion in a breast of a subject may be determined during a molecular breast imaging ("MBI") procedure where the resolving power of the detectors, such as gamma cameras, that degrades with distance from the face of the detector is exploited. By comparing the apparent size of a lesion in two opposing detectors, it is possible to estimate the distance of the lesion from each detector by modeling or measuring the resolution that changes with distance from the detectors. The systems and methods may be used during biopsy procedures to indicate the appropriate needle depth for biopsy of the lesion.