International journal of radiation oncology, biology, physics
-
Int. J. Radiat. Oncol. Biol. Phys. · Jan 2005
Acute complications of MammoSite brachytherapy: a single institution's initial clinical experience.
To report the acute complications incurred by the initial 37 patients who underwent accelerated partial breast irradiation with the MammoSite balloon breast brachytherapy applicator at the Medical University of South Carolina. ⋯ The types of complications in this experience were similar to those in the Phase I trial of the MammoSite brachytherapy applicator. However, catheter failure due to leak occurred in our experience and was not described in the Phase I trial. The incidence of complications was greater in our series than in the Phase I trial; however, differences in toxicity scoring and the length of follow-up between the two series impeded direct comparisons. The incidences of complications over time reflect the steep learning curve for accelerated partial breast irradiation using the MammoSite brachytherapy applicator. Finally, radiation recall dermatitis developed in 1 patient treated after this review was completed.
-
Int. J. Radiat. Oncol. Biol. Phys. · Jan 2005
Impact of tumor repopulation on radiotherapy planning.
Biologic/functional imaging (e.g., fluorodeoxyglucose/3'-deoxy-3'-fluorothymidine-positron emission tomography) is promising to provide information on tumor cell repopulation. Such information is important in the design of biologically conformal radiotherapy for cancer. The questions remaining unclear are whether it is necessary to escalate the dose to the regions with rapid cell repopulation in the tumor target and, if so, by how much. The purpose of this work was to address these questions using radiobiologic modeling. ⋯ Dose escalation is necessary to offset the accelerated tumor cell repopulation during prolonged treatment courses. This study provides a preliminary estimate of the dose escalation for prostate cancer based on the in situ measurements of potential doubling time and radiobiologic models. The proposed dose prescriptions are technically feasible for clinical trials.
-
Int. J. Radiat. Oncol. Biol. Phys. · Jan 2005
Randomized Controlled Trial Clinical TrialConcurrent chemo-radiotherapy with mitomycin C compared with porfiromycin in squamous cell cancer of the head and neck: final results of a randomized clinical trial.
Previous randomized trials have shown a benefit with concurrent use of the hypoxic cell cytotoxin mitomycin C (MC) and radiation (RT) in the management of squamous cell cancer of the head and neck (SCCHN). We conducted a randomized trial comparing MC with porfiromycin (POR) in combination with RT in the management of SCCHN. ⋯ Despite promising preclinical data, and an acceptable toxicity profile, POR was inferior to MC as an adjunct to RT in the management of SCCHN. This randomized trial emphasizes the need for randomized studies to evaluate new agents in the management of SCCHN.
-
Int. J. Radiat. Oncol. Biol. Phys. · Jan 2005
A practical approach to thermography in a hyperthermia/magnetic resonance hybrid system: validation in a heterogeneous phantom.
This study investigates the feasibility and accuracy of noninvasive magnetic resonance (MR) monitoring for a system that includes a multiantenna applicator for part-body hyperthermia (SIGMA-Eye applicator, BSD-2000/3D) and a 1.5 Tesla MR tomograph (Siemens Magnetom Symphony). ⋯ On-line MR monitoring of regional hyperthermia by using the PFS method is feasible in a phantom setup and can be further developed for clinical applications.
-
Int. J. Radiat. Oncol. Biol. Phys. · Jan 2005
Atlas-based automatic segmentation of MR images: validation study on the brainstem in radiotherapy context.
Brain tumor radiotherapy requires the volume measurements and the localization of several individual brain structures. Any tool that can assist the physician to perform the delineation would then be of great help. Among segmentation methods, those that are atlas-based are appealing because they are able to segment several structures simultaneously, while preserving the anatomy topology. This study aims to evaluate such a method in a clinical context. ⋯ Results demonstrate that the method is repeatable, provides a good trade-off between accuracy and robustness, and leads to reproducible segmentation and labeling. These results can be improved by enriching the atlas with the rough information of tumor or by using different laws of deformation for the different structures. Qualitative results also suggest that this method can be used for automatic segmentation of other organs such as neck, thorax, abdomen, pelvis, and limbs.