Journal of medical imaging and radiation oncology
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J Med Imaging Radiat Oncol · Apr 2012
Comparative StudyOptimising the dosimetric quality and efficiency of post-prostatectomy radiotherapy: a planning study comparing the performance of volumetric-modulated arc therapy (VMAT) with an optimised seven-field intensity-modulated radiotherapy (IMRT) technique.
The purpose of this study was to compare and evaluate radiotherapy treatment plans using volumetric modulated arc therapy (VMAT) and intensity modulated radiotherapy (IMRT) for post-prostatectomy radiotherapy. ⋯ VMAT can achieve post-prostatectomy radiotherapy plans of comparable quality to IMRT with the potential to reduce dose to OAR and improve the efficiency of treatment delivery.
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J Med Imaging Radiat Oncol · Apr 2012
Case ReportsUncommon pulmonary metastasis presenting as pulmonary infarction with tumour emboli in two cases.
We report two cases of pathologically proven pulmonary metastases presenting as pulmonary infarction with tumour emboli. In two cases, high-resolution CT showed multiple small subpleural consolidations in both lungs. The patients had breast cancer and uterine cervix cancer, respectively. Although various pulmonary diseases show subpleural consolidations on CT, pulmonary metastases by tumour emboli should be primarily considered in differential diagnosis especially when the patient has known malignancy.
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J Med Imaging Radiat Oncol · Feb 2012
Negative coronary CT angiography for chest pain assessment predicts low event rate in 5 years.
Coronary CT angiography (CTA) is becoming a popular investigation for chest pain. A negative coronary CTA is known to have a good negative predictive value for major adverse cardiovascular events in short term. The data on the long-term outcomes of negative coronary CTA are lacking. We aim to investigate the long-term prognostic value of negative coronary CTA in the evaluation of chest pain. ⋯ A negative coronary CTA in patients with a low or intermediate pretest probability for significant coronary artery disease predicts a low rate of major cardiovascular events within a 5-year period.
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J Med Imaging Radiat Oncol · Dec 2011
Randomized Controlled Trial Comparative StudyDose comparisons for conformal, IMRT and VMAT prostate plans.
Volumetric-modulated arc therapy (VMAT) is a relatively new treatment technique in radiation therapy. A comparison study of conformal, intensity-modulated radiation therapy (IMRT) and single- and double-arc VMAT plans was undertaken to evaluate the dosimetric impact of this new technology in prostate cases. The research questions were as follows: how does VMAT dosimetry compare with IMRT and conformal plans?; does VMAT increase the volume of bowel receiving lower doses?; are one or two VMAT arcs required for standard prostate cases? ⋯ Single- and double-arc VMAT consistently resulted in favourable or slightly superior dosimetry when compared with static gantry IMRT for prostate cases. Both the VMAT techniques and static gantry IMRT resulted in superior critical tissue sparing when compared with conformal plans.
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This paper outlines the key results of the Faculty of Radiation Oncology 2010 workforce survey and compares these results with earlier data. ⋯ There are a relatively large and increasing number of radiation oncologists and trainees compared with previous years. The excessive workloads evident in previous surveys appear to have diminished. However, further work is required on assessing the impact of ongoing feminisation and sub-specialisation.