Scintillating Fiber Coil for Non-Invasive PET Input Function Measurement
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Solution Overview
Problem
Current methods for acquiring an input function (IF) in PET, SPECT, and PET-MRI imaging are invasive, causing patient discomfort and risking blood-borne disease transmission, while non-invasive techniques face issues with background rejection and spatial resolution.
Innovation Solution
A method using a scintillating fiber coil to detect photons produced by a radiotracer interaction, determining the position of interaction based on timing parameters and adjusting for background radiation, to establish a kinetic model input function non-invasively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If invasive arterial blood sampling is used to acquire the input function, then measurement precision is improved, but patient comfort deteriorates and risk of blood-borne disease transmission increases
Solution Approach 1:
The patent introduces an intermediary substance (radiotracer) that interacts with the scintillating fiber coil to produce detectable photons. This mediator enables indirect measurement of the input function through photon detection rather than direct blood sampling, thus maintaining measurement precision while eliminating invasive procedures and their associated harms
Solution Approach 2:
The patent replaces the mechanical invasive blood sampling system with an optical detection system using scintillating fiber coils and photon detectors. This substitution eliminates the need for physical blood withdrawal while achieving the same measurement goal through non-invasive optical interaction with radiotracers in the vascular system
2Object-affected harmful factors
If non-invasive techniques are used to acquire the input function, then patient comfort is improved, but background rejection and spatial resolution deteriorate
Solution Approach 1:
The patent segments the detection system into multiple scintillating fiber coils positioned at different locations, each detecting photons from specific interaction zones. This segmentation enables spatial resolution by assigning different segments to different spatial regions, allowing the system to distinguish between signal sources at different locations and improve background rejection
Solution Approach 2:
The patent applies local quality by making each scintillating fiber coil and its associated detection region have specialized properties optimized for detecting photons from specific spatial locations. The system assigns different functional characteristics to different segments based on their spatial positions, improving both spatial resolution and background rejection through localized optimization
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
This approach allows for a non-invasive acquisition of the input function with improved spatial resolution and reduced background interference, enhancing the accuracy of PET and SPECT imaging without patient discomfort.
Implementation Method 1
detecting a first plurality and second plurality of photons at first and second ends of the scintillating fiber coil, respectively, the first and second pluralities of photons produced by an interaction event between a radiotracer and the scintillating fiber coil
Data Source
AI summary
Methods and systems for establishing a kinetic model input function (IF) in positron emission tomography and single-photon emission computed tomography are provided. A position of interaction along a scintillating fiber coil is determined by: detecting a first plurality and second plurality of photons at first and second ends of the scintillating fiber coil; associating the first plurality of photons and the second plurality of photons with the interaction event based on a timing parameter; and determining a position of interaction for the interaction event based on a comparison between a first parameter of the first plurality of photons and a second parameter of the photons in the second plurality of photons.