Digital Breast Tomosynthesis Phantom with Reverse Staircase Bead Ramps
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Solution Overview
Problem
Current phantoms for image quality assessment in digital breast tomosynthesis systems are inadequate, as they fail to provide thorough evaluation of reconstructed images and lack comprehensive measurement capabilities, particularly in slice sensitivity profile and 2D information.
Innovation Solution
A phantom with a reverse staircase pattern of beads in proximate parallel vertical planes, embedded in a uniform material mimicking breast tissue, allowing for automated determination of slice sensitivity profile, point spread function, and modulation transfer function, along with additional test objects for comprehensive image quality assessment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional phantoms are used for image quality assessment in digital breast tomosynthesis, then the assessment process is simplified, but the measurement precision and comprehensiveness of slice sensitivity profile and 2D information are insufficient
Solution Approach 1:
The phantom is divided into multiple ramp structures, each containing beads at different vertical positions. This segmentation allows measurement of slice sensitivity at multiple depths simultaneously, improving measurement precision without requiring multiple separate phantoms or repeated scans.
Solution Approach 2:
The phantom transitions from conventional 2D test objects to a 3D structure with beads arranged in ramps at varying vertical positions. This dimensional enhancement enables comprehensive 3D image quality assessment including slice sensitivity profile, point spread function, and modulation transfer function in a single scanning sequence.
2Measurement precision
If multiple separate phantoms or scanning sequences are used to assess different image quality parameters, then comprehensive measurement is achieved, but the productivity and time efficiency are reduced
Solution Approach 1:
Multiple image quality assessment functions are merged into a single phantom structure. The bead ramps, test objects, and calibration features are integrated into one phantom that can be scanned once to obtain slice sensitivity profile, spatial resolution, contrast detail, and other parameters simultaneously.
Solution Approach 2:
The phantom is designed as a universal test object that performs multiple assessment functions: slice sensitivity profile measurement, spatial resolution evaluation, contrast detail analysis, and geometric distortion detection. This multi-functionality eliminates the need for multiple specialized phantoms or scanning sequences.
3Reliability
If conventional 2D projection imaging is used, then the device complexity and radiation dose are reduced, but the image quality and sensitivity in dense breasts deteriorate due to tissue overlap
Solution Approach 1:
The phantom enables preliminary assessment of tomosynthesis system performance before clinical deployment. By measuring slice sensitivity profile and other parameters in advance, the system can be optimized to reduce tissue overlap effects, thereby improving cancer detection sensitivity in dense breasts.
Solution Approach 2:
The invention replaces conventional 2D projection imaging with 3D tomosynthesis reconstruction. By substituting the imaging mechanism from single-plane projection to multi-plane reconstruction, the system achieves better tissue separation and reduced anatomical noise, improving reliability for detecting abnormalities in dense breast tissue.
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
Enables accurate and automated image quality assessment of digital breast tomosynthesis systems, providing detailed insights into slice sensitivity, spatial resolution, and contrast detail with a single scanning sequence, overcoming limitations of existing phantoms.
Implementation Method 1
an x-ray tube is moved in an arcuate or isocentric motion and a series of low-dose images, known as projections, are taken
Implementation Method 2
The beads and other test objects are embedded in a uniform material that mimics x-ray attenuation of breast tissue
Data Source
AI summary
A phantom for image quality assessment of digital breast tomosynthesis apparatus includes at least one set of beads arranged as a first ramp and as a second ramp in respective proximate parallel vertical planes in a reverse staircase pattern along a vertical direction with a final bead of the first ramp and an initial bead of the second ramp being located at substantially the same intermediate height within the phantom. The beads and additional test objects may be positioned in non-overlapping locations within the phantom to facilitate determination of multiple image quality parameters with a single scanning sequence of the phantom.