AEC Memory Architecture for Timely Radiation Exposure Cutoff
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Solution Overview
Problem
Existing radiation imaging apparatuses face delays in controlling radiation irradiation due to memory access operations, leading to accumulated doses exceeding thresholds in automatic exposure control (AEC) functions.
Innovation Solution
The implementation of a radiation imaging apparatus with a detection unit, automatic exposure control unit, and memory control unit, utilizing multiple memories with varying access latencies to manage data efficiently, allowing for timely notification to stop radiation irradiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single memory is used for AEC function data storage, then device complexity is reduced, but control timing delay increases causing accumulated dose to exceed threshold
Solution Approach 1:
The patent divides the memory system into multiple memories with different access latencies. Fast memory stores frequently accessed AEC function data (thresholds, accumulated dose), while slow memory stores less frequently accessed data (imaging parameters, processing results). This segmentation allows the AEC unit to access critical data quickly without increasing overall device complexity.
Solution Approach 2:
The patent assigns different access speed characteristics to different memory components based on their specific usage requirements. The fast memory is strategically positioned to store data that requires rapid access for AEC decisions, while slow memory handles data with less stringent timing requirements. This local optimization of memory quality resolves the contradiction between simplicity and speed.
2Speed
If multiple memories with different access latencies are used, then control timing is improved, but device complexity increases
Solution Approach 1:
The patent introduces a memory control unit as an intermediary that manages data storage and retrieval across multiple memories. This mediator handles the complexity of coordinating fast and slow memories, presenting a unified interface to the AEC unit and other system components. The intermediary absorbs the management complexity while enabling high-speed access where needed.
Solution Approach 2:
The patent adds a temporal dimension to memory organization by using memories with different access latencies. Instead of a single flat memory structure, the system creates a hierarchical memory architecture where data can be accessed at different speeds based on urgency. This dimensional change enables fast access for time-critical AEC operations while maintaining overall system organization.
3Loss of time
If memory access operations are optimized, then control timing is improved, but data management complexity increases
Solution Approach 1:
The patent implements preliminary action by pre-loading frequently accessed AEC data into fast memory before it is needed. The system anticipates which data will be required for upcoming AEC decisions and positions it in high-speed memory in advance. This proactive data placement reduces access time during critical moments while keeping the management system relatively simple.
Solution Approach 2:
The patent employs feedback mechanisms where the memory control unit monitors access patterns and adjusts data placement between fast and slow memories based on actual usage. This feedback-driven optimization allows the system to adapt to changing data access requirements without requiring complex predetermined management rules, balancing speed improvement with manageable complexity.
Data Source
AI summary
A radiation imaging apparatus includes a detection unit that detects radiation applied by a radiation generating apparatus, an automatic exposure control unit that determines whether to stop application of radiation based on an accumulated dose of the detected radiation and to notify the radiation generating apparatus of an instruction to stop the application of radiation in a case where it is determined to stop the application of radiation, a plurality of memories, and a memory control unit that stores, in a first memory from among the plurality of memories, data to be used when the automatic exposure control unit makes the determination.