TY - JOUR
T1 - Portal dose images II
T2 - Patient dose estimation
AU - Ying, Xingren
AU - Geer, Lewis Y.
AU - Wong, John W.
N1 - Funding Information:
Reprint requests to: John W. Wong, Ph.D., Mallinckrodt Institute of Radiology, Physics Section, 5 10 South Kingshighway Blvd., St. Louis, MO 63110. Supported in part by NC1 grant RO 1-CA4 1574. Accepted for publication 20 December 1989.
PY - 1990/6
Y1 - 1990/6
N2 - Due to the many sources of uncertainties in radiotherapy, conventional treatment planning can only provide a nominal presentation of the dose delivered to the patient. Provided that large setup errors can be detected and corrected, we propose that measured and calculated portal dose images can be used to improve estimation of patient dose. The iterative approach described in this paper requires an accurate method of dose calculations, 3-dimensional CT data that closely represents the patient and the measured portal dose image. From the CT data, a portal dose image is calculated for comparison with the measured one. The differences are then used to modify the original CT data so that a new image can be calculated. The process is repeated until the calculated and measured images agree to satisfaction. At that point, the internal dose is calculated using the modified CT data. If the method is successful, daily portal dose images could be used to cumulatively estimate patient dose throughout the course of treatment. This manuscript describes 60Co simulation results to demonstrate the feasibility of the approach.
AB - Due to the many sources of uncertainties in radiotherapy, conventional treatment planning can only provide a nominal presentation of the dose delivered to the patient. Provided that large setup errors can be detected and corrected, we propose that measured and calculated portal dose images can be used to improve estimation of patient dose. The iterative approach described in this paper requires an accurate method of dose calculations, 3-dimensional CT data that closely represents the patient and the measured portal dose image. From the CT data, a portal dose image is calculated for comparison with the measured one. The differences are then used to modify the original CT data so that a new image can be calculated. The process is repeated until the calculated and measured images agree to satisfaction. At that point, the internal dose is calculated using the modified CT data. If the method is successful, daily portal dose images could be used to cumulatively estimate patient dose throughout the course of treatment. This manuscript describes 60Co simulation results to demonstrate the feasibility of the approach.
KW - On-line radiotherapy imaging
KW - Patient dose estimation
KW - Treatment uncertainties
KW - Treatment verification
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U2 - 10.1016/0360-3016(90)90323-C
DO - 10.1016/0360-3016(90)90323-C
M3 - Article
C2 - 2370196
AN - SCOPUS:0025321153
SN - 0360-3016
VL - 18
SP - 1465
EP - 1475
JO - International journal of radiation oncology, biology, physics
JF - International journal of radiation oncology, biology, physics
IS - 6
ER -