Gamma index analysis calculation

Nada Zamri

2017 8 24

0 个回答

9 次查看（30 天）

0 个投票

I have two matrix values of size 27 cm x27 cm (A1 and A20 and I would like to get the difference in distance value and also difference in dose for each pixel. Given below is the formula, sqrt((r/DTA)^2+(dose/DD)^2) DTA has been set fixed to 2 and DD to 0.03 r is the radius between one pixel to another (for eg. in this case we use 2, so we want to define the difference in distance 2 mm from one pixel), dose is simply the dose difference from one pixel to another. Note that, the value inside 27x27 matrix earlier is the value of dose in each pixel.

I have tried earlier using this code, but I dont know how to calclate difference in distance for the given DTA= 2 mm

DTA=3; dosed=0.03; size1=size (A1) ; size2=size (A2) ; G=zeros (size1) ; %this will be the output Ga=zeros (size1) ; for i = 1 : size1(1) for j = 1 : size1(1) d2 =(A1(i,j)- A2(i,j))^2 ; %difference squared Ga(i,j) = sqrt(r2/(DTA^2)+ d2/(dosed)^2); end end

Really appreciate if someone can help with this Tq