美国CIRS 062MQA超声波测试模体，CIRS 062MQA模体简介

062MQA的设计目的是提供一种工具，用于集成在放射治疗设备中的锥形束CT系统的电子密度校准和图像质量评估。体模的电子校准功能增强了自适应放射治疗的效果，而图像质量特征处理了优化图像质量和min辐射剂量之间的微妙平衡。062MQA CBCT电子密度&图像质量幻影由多个部分组成:100mm厚的body slab、100mm厚的CBCT图像质量幻影、50mm厚的电子密度幻影，以及由37.5mm厚的均匀平板、12.5mm厚的均匀平板和50mm厚的均匀平板组成的Bolus。100毫米厚的身体部分有一个中心孔，接收CBCT图像质量幻影。每个Bolus平板上都钻了孔，以容纳离子室插入物，并允许离子室测量，而不管插入物的成像质量如何。选择切片的厚度是为了在光束的中轴上定位包含图像质量特征的任何层。不同厚度的截面减小了电子密度截面与中心轴的偏移增量。幻影支持连同激光对准标志，使轻松和快速定位的幻影上的加速器沙发。幻影是放置在支持轨道的帮助下加工凹槽。缓冲板用于减少来自支持设备的工件，并允许用户访问支持板上的手柄。支撑的调平和隐含的幻影是通过调整调平脚来实现的。

美国CIRS 062MQA特点:

The One Tool Solution for Electron Density Calibration & Image Quality Assessment

CBCT Image Quality Phantom

The Phantom is comprised of four la[x]yers: spatial resolution, CT number linearity/slice thickness, low contrast and uniformity. The positioning of the different la[x]yers of the CBCT Image Quality phantom at the central axis can be done with the phantom in the 100mm body section or with the phantom placed directly on the support device.

Spatial Resolution la[x]yer

The Spatial Resolution la[x]yer is designed to evaluate the spatial resolution of IGRT systems. Line pair patterns from 1 lp/cm to 16 lp/cm are em[x]bedded in the background. In order to minimize artifacts, each line pair pattern is made from a material with 350HU greater than the background attenuation. The line pair patterns are 3D patterns 12mm in height along the longitudinal axis of the CBCT Image Quality Phantom. The spatial resolution targets are arranged in a circular pattern.

CT Number Linearity and Slice Thickness la[x]yer

The CT number Linearity and Slice Thickness la[x]yer is designed to determine Contrast-to-noise Ratio, Hounsfield number accuracy and Slice Thickness Sensitivity. Six rods made of Air, Low Density Polyethylene (LDPE), Polystyrene, Acrylic, Delrin and Teflon are used to measure the CnR and Hounsfield number Accuracy. Three angled air channels arranged in an equilateral triangle can be used to assess Slice thickness sensitivity.

Low Contrast la[x]yer

The Low Contrast la[x]yer is intended to assess the system's ability to detect small differences in contrast. It contains three sets of low contrast rods with linear attenuation differences of 0.5%, 1% and 2% relative to the background material. The diameters of the low contrast rods were chose to provide a 0.5 ratio between two adjacent rods by cross section and volume. Additional features are designed to evaluate the magnification on the orthogonal axes of the transversal image and as input for calculation of the Point Spread Function and subsequent calculation of Modulation Transfer Function.

Uniformity la[x]yer

The Uniformity la[x]yer is designed to measure the system’s ability to produce uniform images across the field of view of an ob[x]ject with highly homogeneous physical properties in all directions.

Electron Density Phantom

The Phantom consists of nested disks made from Plastic Water?. The nested disks allow simulation of both head and abdomen phantom configurations. Eight different tissue equivalent inserts can be positioned at 17 different locations within the scan field. The geometry of the phantom also enables the user to take measurement offset from the central axis.

NOTE: This product or an optional accessory of this product requires a CIRS dosimetry cavity code before an order can be placed. Please refer to the Dosimetry Cavity Codes document to identify the CIRS code for the probe you intend to use with this product.

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