Photon-Counting CT Data Correction for High-Dose Pile-Up
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Solution Overview
Problem
Photon counting computed tomography (PCCT) detectors are susceptible to pile-up errors during high-dose imaging, leading to erroneous detection of radiation counts and energy, which affects imaging data accuracy.
Innovation Solution
A medical diagnostic device and method that corrects main imaging data using positioning imaging data acquired at a lower dose, through processes such as forward projection, noise reduction, error estimation, and component mixing to synchronize and align imaging trajectories, thereby reducing the influence of pile-up.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a high dose is used for main imaging to collect diagnostic images, then image quality and signal-to-noise ratio are improved, but pile-up errors occur leading to erroneous detection of radiation counts and energy
Solution Approach 1:
The patent performs preliminary action by acquiring positioning imaging data at a low dose before main imaging, and pre-calculating the pile-up correction value based on this positioning data. This preliminary correction value is then used to correct the main imaging data, thereby preventing pile-up errors from affecting the final diagnostic images while maintaining high dose imaging quality
Solution Approach 2:
The patent introduces an intermediary mechanism by using positioning imaging data as a mediator to calculate the pile-up correction value. This correction value acts as an intermediary factor that bridges the low-dose positioning data and the high-dose main imaging data, allowing accurate correction of pile-up effects without directly compromising the high-dose imaging process
2Loss of information
If a photon counting detector is used to identify energy and count radiation photons, then more information is obtained compared to charge integration type detectors, but the detector is more susceptible to pile-up errors during high-dose imaging
Solution Approach 1:
The patent implements feedback by using the positioning imaging data to calculate a pile-up correction value, which is then fed back to correct the main imaging data. This feedback mechanism ensures that the additional information obtained from photon counting is preserved while compensating for the pile-up errors that occur during high-dose imaging
Solution Approach 2:
The patent performs preliminary calculation of the pile-up correction value based on positioning imaging data before the main imaging process. This preliminary action prepares the correction mechanism in advance, allowing the photon counting detector to maintain its high information capability while correcting for pile-up effects in the final diagnostic images
Data Source
AI summary
Provided are a medical diagnostic device, a data control method, and a storage medium storing that are less likely to be affected by pile-up even during imaging with a high dose.A medical diagnostic device includes at least one processor, in which the processor acquires positioning imaging data obtained by scanning a subject with a first dose before main imaging of the subject and main imaging data obtained by performing the main imaging on the subject with a second dose higher than the first dose, and corrects the main imaging data by specific processing using at least the positioning imaging data, to output corrected imaging data.