Radio-Optical Triggering for Cherenkov Imaging Synchronization
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Solution Overview
Problem
Current Cherenkov imaging systems require direct electrical interfacing with linear accelerators (LINACs) for synchronization, which is cumbersome and interferes with normal operations, and traditional CMOS image sensors fail to capture weak and brief Cherenkov light emissions effectively.
Innovation Solution
A radio-optical triggering unit (RTU) that uses scattered radiation to generate a digital timing signal for Cherenkov imaging systems, allowing for remote synchronization and integration with pulse-gated, multiple-pulse-integrating (PG-MPI) CMOS image sensors to capture Cherenkov light emissions without electrical interfacing with the LINAC.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If direct electrical interfacing with LINAC is used for synchronization, then Cherenkov imaging can be synchronized to beam pulses, but it interferes with normal LINAC operations and requires rigorous verification
Solution Approach 1:
The patent introduces an optical intermediary (laser pointer or LED) that converts LINAC beam pulse timing into optical signals detectable by photodetectors. This optical intermediary mediates between the LINAC electrical system and the imaging system, allowing synchronization without direct electrical interfacing, thus avoiding interference with LINAC operations while maintaining reliable beam pulse synchronization
Solution Approach 2:
The patent replaces the electrical synchronization mechanism with an optical-based timing system. Instead of using electrical signals from LINAC service panels, the system uses optical signals (laser or LED) triggered by beam pulses to synchronize the imaging system, substituting electrical interfacing with an optical detection approach that does not interfere with LINAC operations
2Ease of manufacture
If traditional CMOS image sensors are used, then the system is simple and economical, but they fail to capture weak and brief Cherenkov light emissions effectively
Solution Approach 1:
The patent implements periodic gating of the image sensor to coincide with the periodic beam pulses. The sensor is activated only during brief windows corresponding to each beam pulse duration, allowing accumulation of weak Cherenkov signals over multiple pulses while rejecting continuous background light. This periodic action enables traditional CMOS sensors to effectively capture brief Cherenkov emissions that would otherwise be lost in background illumination
Solution Approach 2:
The system performs preliminary timing calibration using the optical intermediary to establish precise trigger thresholds and gate widths before actual Cherenkov imaging. This preliminary action optimizes the sensor activation parameters to match the specific beam pulse characteristics, ensuring maximum signal capture while minimizing background interference
3Measurement precision
If beam shape verification is performed for each patient, then treatment accuracy is improved, but time and resource consumption increases
Solution Approach 1:
The Cherenkov imaging system enables self-verification of beam shape and dosage profile by directly visualizing the radiation interaction with tissue or tissue-equivalent media. The system captures images of Cherenkov light emitted during treatment, providing immediate feedback on beam characteristics without requiring separate verification procedures, thus improving both accuracy and efficiency
Solution Approach 2:
The system performs beam verification continuously during treatment delivery rather than as separate pre-treatment or post-treatment measurements. By capturing Cherenkov images during actual beam-on time, the system provides real-time verification that does not add separate measurement time, maintaining treatment throughput while ensuring beam accuracy
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 rapid and accurate characterization of radiation treatment plans, providing high-resolution images of Cherenkov radiation in real-world clinical settings, even in well-lit environments, without interfering with LINAC operations and improving image quality by integrating light over multiple pulses.
Implementation Method 1
A radio-optical triggering unit (RTU) that uses scattered radiation to generate a digital timing signal
Implementation Method 2
Cherenkov light emitted by tissue, or by media with radiological properties similar to those of tissue (such as water), can be used as a proxy for radiation delivered to tissue
Implementation Method 3
Cherenkov light emissions from a medical LINAC's beam in water or tissue are weak and appear in brief pulses
Implementation Method 4
integrating light over multiple pulses
Data Source
AI summary
A Cherenkov imaging system includes a high-speed radiation detector configured to provide a first timing signal synchronized with pulses of radiation to control operation of at least one pulse-gated, multiple-pulse-integrating, (PG-MPI) CMOS camera synchronized through the digital time signal to pulses of the radiation beam source, to image Cherenkov radiation; and a digital image-processing system. The high-speed radiation detector is either a solid-state radiation detector or a scintillator with a photodetector. The system images Cherenkov light emitted by tissue by using a timing signal synchronized to pulses of a pulsed radiation beam to control the PG-MPI camera by integrating light received by the PG-MPI camera during multiple pulses of the radiation beam while excluding light received by the camera between pulses of the radiation beam.