Historically, Radiation Therapy (RT) has played a minor role in the treatment of hepatocellular carcinoma, especially because of toxicity related to conventional techniques. However, high radiation doses can now be given safely by means of 3D-conformal techniques and other more specialized techniques. 3D-conformal RT, in which both target definition and treatment planning are based on three-dim...

This work is part of a collaboration with the cancer institute L eon B erard (Lyon, France) and concerns conformal radiotherapy. The current medical process begins by acquiring a reference computed tomog-raphy volume of a patient, and by computing an irradiation procedure. During several weeks, the patient comes every day for an irradiation session. In order to have a safe and eecient irradiati...

introduction polymer gel dosimeters offer a practical solution to 3d dose verification for conventional radiotherapy as well as intensity-modulated and stereotactic radiotherapy. in this study, egsnrc calculated and pagat polymer gel dosimeter measured dose profiles from single shot irradiation with 18 mm collimator of gamma knife in homogeneous and inhomogeneous phantoms were compared with eac...

background: external beam radiotherapy (ebrt) is mainstay of treatment in patients with locally advanced cervical carcinoma (lacc). three dimensional conformal radiotherapy (3dcrt) and intensity modulated radiotherapy (imrt) are mainly used in ebrt. however which one is superior is still controversial. materials and methods: forty patients of lacc treated with imrt were selected for this study....

Postoperative radiation therapy substantially decreases local relapse and moderately reduces breast cancer mortality, but can be associated with increased late mortality due to cardiovascular morbidity and secondary malignancies. Sophistication of breast irradiation techniques, including conformal radiotherapy and intensity modulated radiation therapy, has been shown to markedly reduce cardiac ...

Patients with early stage high-risk prostate cancer (prostate specific antigen > 20, Gleason score > 7) are at high risk of recurrence following prostate cancer irradiation. Radiation dose escalation to the prostate may improve biochemical-free survival for these patients. However, high rectal and bladder dose with conventional three-dimensional conformal radiotherapy may lead to excessive gast...

An algorithm has been developed to calculate the collimator jaw motions required to generate intensity-modulated fields far use in conformal radiotherapy. The dynamic technique allows arbitrary intensity profiles to he generated using a single unidirectional sweep of the collimators. The collimator jaws have independent motion, so that an aperture of variable width is scanned across the field. ...

The purpose of this study is to assess intensitymodulated radiotherapy (IMRT) treatment plans with three-dimensional conformal radiotherapy (3DCRT) plans for different sites of recurrent nasopharyngeal carcinoma. We treated 3 cases of different sites of recurrent nasopharyngeal carcinoma with IMRT techniques and 3D-CRT technique. These different plans were compared with respect to dose conformi...

BACKGROUND & OBJECTIVE Radiotherapy and chemotherapy are major therapies for locally advanced pancreatic cancer. This study was to evaluate the efficacy of three-dimensional conformal gamma-knife radiotherapy combined with thermochemotherapy on locally advanced pancreatic cancer. METHODS From December 2001 to January 2006, 75 patients with locally advanced pancreatic cancer were divided into ...