Adjustable Multi-Slit Collimators for Radiation Therapy
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Solution Overview
Problem
Conventional multi-leaf collimators (MLCs) in radiation therapy limit the efficiency of delivering radiation, particularly in energy-modulated and microbeam therapies, as they impose constraints on beam intensity modulation and shape adjustment.
Innovation Solution
The development of multi-slit collimators (MSCs) that form arrays of adjustable slits, enabling discontiguous beam intensity patterns and allowing simultaneous exposure of multiple smaller areas to radiation, thereby providing additional variables for treatment planning and optimization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional multi-leaf collimators (MLCs) are used for beam shaping, then the device structure is relatively simple and easy to operate, but the beam intensity modulation efficiency and treatment productivity are limited
Solution Approach 1:
The collimator is divided into multiple independently controllable leaves that can be positioned at different locations to form various slit patterns. Each leaf can be individually adjusted to create discontiguous beam intensity patterns, enabling simultaneous exposure of multiple smaller areas to radiation and significantly improving treatment productivity
Solution Approach 2:
The collimator leaves are designed to be dynamically adjustable during treatment, allowing real-time modification of slit widths and patterns. This dynamic capability enables adaptive beam intensity modulation without requiring multiple treatment setups, thereby improving radiation delivery efficiency while maintaining operational flexibility
2Manufacturing precision
If conventional MLCs are used, then the device is easier to manufacture and operate, but the precision of beam intensity control and dose conformity is insufficient
Solution Approach 1:
Different regions of the collimator can be manufactured with locally optimized properties, such as varying leaf thicknesses, materials, or positioning mechanisms tailored to specific beam energy ranges or treatment requirements. This allows high-precision beam intensity control in critical areas while simplifying manufacturing in less demanding regions
Solution Approach 2:
The collimator design allows for adjustable parameters such as slit width, slit pattern, and leaf positioning that can be optimized for different treatment scenarios. These parameter changes enable precise beam intensity control without requiring complete redesign of the collimator structure for each treatment case
3Adaptability or versatility
If conventional MLCs are used for beam shaping, then the treatment planning is simpler, but the adaptability to different therapy types (e.g., energy-modulated, microbeam) is limited
Solution Approach 1:
The collimator is designed with universal functionality to support multiple therapy types including conventional radiation therapy, energy-modulated therapy, and microbeam therapy. The same adjustable leaf mechanism can create different slit patterns suitable for various treatment modalities, eliminating the need for separate collimators for each therapy type
Solution Approach 2:
The collimator introduces an additional dimension of control by enabling discontiguous beam intensity patterns and multiple slit configurations beyond the traditional single aperture approach. This extra degree of freedom provides enhanced adaptability to different therapy types while maintaining a unified device structure
Data Source
AI summary
The transverse intensity distribution of a beam of x-rays or other radiation can be modulated with a multi-slit collimator device that includes one or more sets of collimator leaves arranged in a one-dimensional array and individually movable to form slits of variable width between pairs of adjacent collimator leaves. A two-dimensional intensity distribution may be achieved using multiple sets of one-dimensionally arranged leaves, e.g., by stacking them along the beam in different orientations, or by stacking them in a transverse direction to form a two-dimensional array of leaves. In some embodiments, the multi-slit collimator device also serves beam-monitoring purposes.