Radiation Image Analysis Device SID Measurement
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Solution Overview
Problem
Existing methods for determining the distance between a radiation source and a radiation detector in radiation imaging are hindered by difficulties in adjusting positional relationships, manual object thickness measurement, and obstruction of measurement light by objects, leading to inaccuracies and inefficiencies.
Innovation Solution
A radiation image analysis device and method that automatically calculates the distance between a radiation source and detector using acquired distance-dependent information from radiation images, including received dose and intra-object structure lengths, through multiple functions representing correspondence relationships between these parameters, allowing for accurate determination even with objects between the radiation exposure unit and detector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the boundary of the exposure field by the collimator is used to determine SID, then the SID can be calculated based on the ratio of exposure field width to diaphragm width, but the detection surface must be visible and the positional relationship must be adjustable
Solution Approach 1:
The patent replaces the mechanical/optical method of using collimator boundaries and exposure field ratios with an ultrasonic measurement system. The ultrasonic range finder emits sound waves to directly measure the distance from the radiation source to the detection surface, eliminating the need for visual alignment and positional adjustment of collimator boundaries.
Solution Approach 2:
The patent introduces an ultrasonic range finder as an intermediary measurement device between the radiation source and detection surface. This intermediary device uses sound wave propagation to measure distance, serving as a mediator that bridges the gap between the radiation imaging system and the SID measurement requirement without interfering with the primary imaging function.
2Measurement precision
If manual object thickness measurement is performed to determine SID, then the SID can be calculated by adding object thickness to source-object distance, but the process is time consuming
Solution Approach 1:
The patent implements a system where the SID is determined automatically through ultrasonic measurement without requiring manual object thickness measurement. The ultrasonic range finder performs the measurement autonomously, and the calculation unit automatically computes the SID by adding the measured source-object distance to the detected object thickness, eliminating manual intervention and accelerating the imaging process.
Solution Approach 2:
The patent replaces the manual measurement process with an automated ultrasonic measurement and calculation system. The ultrasonic range finder automatically measures distances, and the calculation unit automatically computes SID, substituting the manual mechanical measurement process with an automated electronic system that operates rapidly without human intervention.
3Extent of automation
If ultrasonic range finder is used to directly measure SID, then the measurement is direct and automated, but the measurement light is obstructed by objects between the radiation exposure unit and detector
Solution Approach 1:
The patent positions the ultrasonic range finder as an intermediary device located at the radiation source side, measuring the distance to the detection surface indirectly through sound wave propagation. This intermediary measurement approach bypasses the obstruction problem caused by objects in the radiation path, as ultrasonic waves can penetrate or diffract around objects that block optical measurement light.
Solution Approach 2:
The patent changes the measurement parameter from optical measurement (light-based) to acoustic measurement (sound-based). By using ultrasonic waves instead of optical measurement light, the system overcomes the obstruction problem since ultrasonic waves have different propagation characteristics that allow them to navigate around or through objects that block optical paths.
Data Source
AI summary
The distance between the radiation source and an object (SOD value) is acquired, distance dependent information which is obtained from a radiation image and changes with the distance between a radiation source and a radiation detector (SID value) is acquired, a temporary thickness of the object is determined by a first function representing the correspondence relationship of first information having at least one piece of the distance dependent information, the SID value, and the thickness of the object, and the temporary SID value is determined by adding the SOD value to the determined value. The thickness of the object is determined by a second function representing the correspondence relationship of second information having at least one piece of the distance dependent information, the SID value, and the thickness of the object, and the SID value is determined by adding the SOD value to the determined value.