International journal of radiation oncology, biology, physics
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Int. J. Radiat. Oncol. Biol. Phys. · Jul 2002
MRI simulation: effect of gradient distortions on three-dimensional prostate cancer plans.
To quantify the dosimetric consequences of external patient contour distortions produced on low-field and high-field MRIs for external beam radiation of prostate cancer. ⋯ For patients with lateral separations <40 cm, a homogeneous calculation simulated using a 1.5 T MRI or a 0.23 T MRI with a gradient distortion correction will yield a monitor unit calculation indistinguishable from that generated using CT simulation.
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Int. J. Radiat. Oncol. Biol. Phys. · Jul 2002
Postoperative radiotherapy in 423 patients with pT3N0 prostate cancer.
To evaluate the treatment outcome in pT3N0 patients with adenocarcinoma of the prostate treated with an elective course of postoperative irradiation (RT). ⋯ Adjuvant radiotherapy, as given in this study, appears to substantially reduce the expected incidence of local tumor recurrence in pT3N0 prostate cancer patients. The treatment outcome was poor in pT3bN0 and Gleason score 7-10 patients, with >80% showing evidence of clinical or PSA recurrence at 10 years after therapy. This group should be the target of a prospective trial of systemic therapy.
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Int. J. Radiat. Oncol. Biol. Phys. · Jul 2002
Randomized Controlled Trial Clinical TrialRandomized phase II chemotherapy and radiotherapy trial for patients with locally advanced inoperable non-small-cell lung cancer: long-term follow-up of RTOG 92-04.
The standard treatment for patients with locally advanced inoperable non-small-cell lung cancer and good prognostic factors has become combined chemotherapy (ChT) and radiotherapy (RT). However, the sequencing of the two modalities, as well as fractionation of RT, has been controversial. The Radiation Therapy Oncology Group (RTOG) Study 92-04 was a randomized Phase II study designed to evaluate further the toxicity and efficacy of 2 different strategies of chemoradiation evaluated in 2 prior RTOG Phase II studies. ⋯ Concurrent ChT and hyperfractionated RT resulted in a significant prolongation of the time to in-field progression, but with higher acute and chronic esophagitis. No other significant differences were observed between the two groups. Investigation with a chemoradio-protector is under way.
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Int. J. Radiat. Oncol. Biol. Phys. · Jul 2002
Multicenter Study Comparative StudyA multi-institutional review of radiosurgery alone vs. radiosurgery with whole brain radiotherapy as the initial management of brain metastases.
Data collected from 10 institutions were reviewed to compare survival probabilities of patients with newly diagnosed brain metastases managed initially with radiosurgery (RS) alone vs. RS + whole brain radiotherapy (WBRT). ⋯ Omission of up-front WBRT does not seem to compromise length of survival in patients treated with RS for newly diagnosed brain metastases.
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Int. J. Radiat. Oncol. Biol. Phys. · Jul 2002
The relationship between educational preparation and performance on the ARRT examination in radiation therapy.
To determine if graduates of different types of educational programs obtain similar scores on the Examination in Radiation Therapy administered by the American Registry of Radiologic Technologists. The results will help inform discussions regarding educational requirements for radiation therapists. ⋯ Although some of the differences in the mean test scores among the three educational groups were statistically significant, all differences were small and do not support one type of educational preparation over another.