From: Fan, Ph.D., Jiajin (Jiajin.Fan@fccc.edu)
Date: Tue May 30 2006 - 06:15:12 CEST
Hi all,
I'm working on proton and carbon dose calculation. I tried to use STEPSIZE
card to change charged particles' stepsize to reduce calculation time. And I
use mgdraw.f to output particle track info to test it. But I found what ever
minimum step size I gave to input file, particle track is always same. Can
anybody tell me what's wrong in my input? Thank you.
Stepsize input card (no other input cards which will affect particle step
size):
* minimum 1.0 cm, maximum 10.0 cm in region 3
STEPSIZE 1. 10.0 3.0 0.0 0.0 0.0
Track info:
* First column: track length of each step; Second column: energy
deposit in this step
* Last column: (carbon) total kinetic energy
0.019366 2.216800 1.000000 0.000000 0.000000 0.000000 0 0
-30 3597.783447
0.012749 1.459835 1.000000 0.000000 0.000000 0.000000 0 1
-30 3596.324463
0.019322 2.213185 1.000000 0.000000 0.999730 -0.023238 0 0
-30 3593.977539
0.008135 0.932023 1.000000 0.000345 0.999730 -0.023238 0 0
-30 3593.045654
0.010283 1.178353 1.000000 0.000000 0.999730 -0.023238 0 0
-30 3591.866943
0.003214 0.368304 1.000000 0.000000 0.999730 -0.023238 0 0
-30 3591.498779
0.002584 0.296127 1.000000 0.000000 0.999730 -0.023238 0 1
-30 3591.203125
The minimum step size is much smaller than 1.0 cm set in input file, and
output info is always same whatever minimum stepsize value set in input
file. I don't know why. Thanks again.
*******************************************
Jiajin Fan, Ph.D.
Research Associate, Radiation Oncology
Fox Chase Cancer Center
432 Rhawn Street, Philadelphia, PA 19111
Tel: (215) 214-1711
Fax:(215) 728-1148
Email: jiajin.fan@fccc.edu
*******************************************
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