International journal of radiation oncology, biology, physics
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Int. J. Radiat. Oncol. Biol. Phys. · Jul 2005
Comparative StudyComparison of the belly board device method and the distended bladder method for reducing irradiated small bowel volumes in preoperative radiotherapy of rectal cancer patients.
To determine the most effective method to reduce the irradiated small bowel volume when using a belly board device (BBD), a distended bladder (DB), or both in patients with rectal cancer undergoing preoperative pelvic radiotherapy (RT). ⋯ The DB was more effective than the BBD for reducing the volume of irradiated small bowel in rectal cancer patients receiving pelvic RT. The combination of the BBD and DB showed an additive effect and was the most effective method for reducing the irradiated small bowel volume.
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Int. J. Radiat. Oncol. Biol. Phys. · Jul 2005
Combination of longitudinal and circumferential three-dimensional esophageal dose distribution predicts acute esophagitis in hypofractionated reirradiation of patients with non-small-cell lung cancer treated in stereotactic body frame.
To evaluate dosimetric predictors of acute esophagitis (AE) and clinical outcome of patients with non-small-cell lung cancer (NSCLC) receiving reirradiation. ⋯ Reirradiation using hypofractionated three-dimensional radiotherapy and SBF immobilization is an effective strategy for palliation of symptoms in selected patients with recurrent NSCLC. The length of the esophagus in the RT field does not predict for AE. However, an increasing number of EDs displaying the combination of longitudinal and circumferential three-dimensional dose distribution along the esophagus is a valuable predictor for AE.
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Int. J. Radiat. Oncol. Biol. Phys. · Jul 2005
Dosimetric correlations of acute esophagitis in lung cancer patients treated with radiotherapy.
To evaluate the factors associated with acute esophagitis in lung cancer patients treated with thoracic radiotherapy. ⋯ The percentage of esophageal volume receiving >35 Gy was the most statistically significant factor associated with mild acute esophagitis.
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Int. J. Radiat. Oncol. Biol. Phys. · Jul 2005
Simultaneous integrated intensity-modulated radiotherapy boost for locally advanced gynecological cancer: radiobiological and dosimetric considerations.
Whole-pelvis irradiation (WPI) followed by a boost to the tumor site is the standard of practice for the radiotherapeutic management of locally advanced gynecologic cancers. The boost is frequently administered by use of brachytherapy or, occasionally, external-beam radiotherapy (EBRT) when brachytherapy does not provide sufficient coverage because of the size of the tumor or the geometry of the patient. In this work, we propose using an intensity-modulated radiotherapy (IMRT) simultaneous integrated boost (SIB), which is a single-phase process, to replace the conventional two-phase process involving WPI plus a boost. Radiobiological modeling is used to design appropriate regimens for the IMRT SIB. To demonstrate feasibility, a dosimetric study is carried out on an example patient. ⋯ An IMRT simultaneous integrated boost to replace the conventional two-phase treatments (whole pelvic irradiation followed by brachytherapy or EBRT boost) is radiobiologically and dosimetricaly feasible for locally advanced gynecological cancers that may not be amenable to brachytherapy for anatomic or medical reasons. In addition to its shorter treatment time, the proposed IMRT SIB can provide significant sparing to normal structures, which offers potential for dose escalation. Issues such as organ motion and changing anatomy as tumor responds still must be addressed.
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Int. J. Radiat. Oncol. Biol. Phys. · Jul 2005
Pulmonary function changes after radiotherapy in non-small-cell lung cancer patients with long-term disease-free survival.
To evaluate the changes in pulmonary function after high-dose radiotherapy (RT) for non-small-cell lung cancer in patients with a long-term disease-free survival. ⋯ A significant decrease in pulmonary function was observed 3 months after RT. No recovery in pulmonary function was seen at 18 and 36 months after RT. The decrease in pulmonary function was dependent on the mean lung dose, and patients with chronic obstructive pulmonary disease had larger reductions in the PFTs.