Measuring dose distributions for enhanced dynamic wedges using a multichamber detector array

1997 ◽  
Vol 24 (9) ◽  
pp. 1515-1519 ◽  
Author(s):  
H. Helen Liu ◽  
Eugene P. Lief ◽  
Edwin C. McCullough
Keyword(s):  
Detector Array ◽  
Dose Distributions

scholarly journals Evaluation and comparison of dose distributions for nasopharyngeal carcinoma patients treated by Jaws-Only IMRT technique and by 3D-CRT technique at Dong Nai General Hospital

2017 ◽  
Vol 1 (T4) ◽  
pp. 79-87
Author(s):  
Tai Thanh Duong ◽  
Son Dong Nguyen ◽  
Loan Thi Hong Truong ◽  
Trang Thi Hong Nguyen
Keyword(s):  
Radiation Therapy ◽  
Nasopharyngeal Carcinoma ◽  
General Hospital ◽  
Radiation Treatment ◽  
Planning System ◽  
Detector Array ◽  
Treatment Planning System ◽  
Dose Distributions ◽  
Array Measurements ◽  
3D Crt

The goal of radiation therapy is twofold: maximize the possibility of destroy malignant cells while minimizing the damage to healthy tissue. The introduction of intensity modulated radiation therapy (IMRT) technique has brought improvements in this goal. Multi-leaf collimator (MLC) is a useful tool for IMRT. However, the use of MLC is not necessarily mandatory. The Panther Treatment Planning System version 4.6, Prowess Inc., enables the implementation of this technique for accelerator without MLC (the socalled Jaws-Only IMRT technique). This study aims to evaluate the results of application of Jaws-only IMRT technique for nasopharyngeal carcinoma patients at Dong Nai general hospital. Twenty five patients were randomly selected for this study. For each patient, two plans were generated: 3D-CRT (Three-Dimensional Radiation Treatment) and JO-IMRT. The dose distributions, dose-volume histograms (DVH), conformity indexes (COIN), homogeneity indexes (HI) were used to compare between these two plans and find out the best plan. Pretreatment verifications were performed for all patients' plans using ion chamber (Farmer Type Chamber FC65-P, IBA), detector array (MapCHECK2, Sun Nuclear Corporation and Octavius 4D 1500, PTW). The average deviation between measurement and calculation for point dose was 2.3±1.1 %, within limit dose constraint. For detector array measurements, the gamma index with 3 % dose difference and 3 mm was higher than 95 %. The results showed that the JO-IMRT technique had generated better dose distribution in the target volume and reduced dose to healthy tissues compared to 3D-CRT.

scholarly journals 3D heterogeneous dose distributions for total body irradiation patients

2011 ◽  
Vol 12 (3) ◽  
pp. 205-214 ◽  
Author(s):  
Marie-Claude Lavallée ◽  
Sylviane Aubin ◽  
Marie Larochelle ◽  
Isabelle Vallières ◽  
Luc Beaulieu
Keyword(s):  
Total Body Irradiation ◽  
Dose Distributions ◽  
Total Body
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