Tissue Maximum Ratio (TMR) is the ratio of dose at a given point and depth in phantom to dose at the same point at the depth of maximum dose in phantom. TMR is a special case of TPR with the reference depth taken as depth of maximum dose.

Tissue phantom ratio (TPR) is defined as the ratio of dose in tissue to dose at reference depth in a phantom1. TMR is similar to TPR except the reference depth is Dmax. For high energy beams, TPR can replace TAR. The dose measurements should be made from the same distances. TPR=dose in tissue/dose in phantom at reference depth.

2017年8月12日 · If adopted at a fixed reference depth, the quantity TPR gives rise to the tissue-maximum ratio (TMR). Thus, TMR is a special case of TPR and may be defined as the ratio of the dose at a given point in phantom to the dose at the same point at the reference depth of maximum dose. 2、Tissue-maximum ratio(TMR,组织最大剂量比） 体模内特 ...

2018年6月26日 · 14 端效应 (shutter correction time) 端效应 的定义是为了精确传递处方剂量到病人，在所计算的治疗时间中所附加或减少的时间 要确定一台给定的治疗机器的端效应，典型的方法是由感兴趣Q点（即体模内的）的测量的两个剂量（D1和Dn）来确定： D1是测量一个相对长的照射时间T（大约是5分钟左右），包括了一个端效应，有： Dn是n次间隔测量的剂量之和，每次照射 …

tmr是指空间同一位置，在两种不同散射条 件下的剂量比。 例如：某加速器的6MV X射线是在体模内 1.5cm（最大剂量点）和SSD=100cm，水模表 面照射野为10cm×10cm条件下刻度的，肿瘤 深 度 为 10cm ， 肿 瘤 剂 量 DT=200cGy ， 问 医 生 给出的处方剂量是多少？

2019年2月24日 · c. 組織最大線量比〈TMR： tissue-maximum ratio〉 （2014 45） STD (通常 Source Iso-center Distance)を一定つまり,検出器を一定の位置に固定し, その位置での照射野の大きさをAとする

2016年2月12日 · These include percent depth dose (PDD), tissue air ratio (TAR), tissue phantom ratio (TPR), and tissue maximum ratio (TMR). PDD refers to absorbed dose at a given point as a percentage of absorbed dose at a reference depth on the central axis, namely the depth of maximum dose (dmax).

Tissue-phantom ratio (TPR) is similar to tissue-air ratio but is used for measurements in a phantom. The TPR is the ratio of dose in tissue at a specified point to the dose at the same point at a fixed reference depth, which is typically 5cm. 1 The ratio is measured with field size and distance from source kept at a constant.

Percentage Depth Dose (PDD), Tissue Air Ratio (TAR), Tissue Phantom Ratio (TPR), and Tissue Maximum Ratio (TMR) are dosimetric quantities defined for this purpose. Percentage depth dose is defined as the quotient of the absorbed dose at any depth to the absorbed dose at a fixed reference depth, usually dmax, expressed as a percentage.

Tissue phantom ration (TPR) is similar to TAR, but is not measured from air. 1 TPR is the ratio of dose at a given depth in a phantom to dose at a reference depth in a phantom. 1 It is important to note that TPR requires the SAD and field size to be the same.