|
KMID : 0384620120230040219
|
|
Korean Journal of Medical Physics
2012 Volume.23 No. 4 p.219 ~ p.228
|
|
|
Analysis on the Dosimetric Characteristics of Tangential Breast Intensity Modulated Radiotherapy
|
|
Yoon Mee-Sun
Kim Yong-Hyeob
Jung Jae-Uk
Nam Taek-Keun
Ahn Sung-Ja
Chung Woong-Ki
Song Ju-Young
|
|
|
Abstract
|
|
|
|
The tangential breast intensity modulated radiotherapy (T-B IMRT) technique, which uses the same tangential fields as conventional 3-dimensional conformal radiotherapy (3D-CRT) plans with physical wedges, was analyzed in terms of the calculated dose distribution feature and dosimetric accuracy of beam delivery during treatment. T-B IMRT plans were prepared for 15 patients with breast cancer who were already treated with conventional 3D-CRT. The homogeneity of the dose distribution to the target volume was improved, and the dose delivered to the normal tissues and critical organs was reduced compared with that in 3D-CRT plans. Quality assurance (QA) plans with the appropriate phantoms were used to analyze the dosimetric accuracy of T-B IMRT. An ionization chamber placed at the hole of an acrylic cylindrical phantom was used for the point dose measurement, and the mean error from the calculated dose was 0.7±1.4%. The accuracy of the dose distribution was verified with a 2D diode detector array, and the mean pass rate calculated from the gamma evaluation was 97.3±2.9%. We confirmed the advantages of a T-B IMRT in the dose distribution and verified the dosimetric accuracy from the QA performance which should still be regarded as an important process even in the simple technique as T-B IMRT in order to maintain a good quality.
|
|
|
KEYWORD
|
|
|
Tangential breast IMRT, Dose homogeneity index, Dose verification
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
  
|