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The aim of the study was to examine the influence of overall treatment time (OTT) on the value of calculated biological effective doses (BEDs) for different biological variables. These variables were: tumour proliferation rate, different cell radiosensitivity (alpha=0.2, 0.3, and 0.4 /Gy), and different start time for repopulation (Tk=21, 28, and 35 days).(More)
PURPOSE To determine the prevalence and anatomic characteristics of infarctlike lesions seen on cranial magnetic resonance (MR) images. MATERIALS AND METHODS The study cohort consisted of 5,888 community-living individuals aged 65 years and older enrolled in a longitudinal, population-based study of cardiovascular disease. MR images were obtained from(More)
INTRODUCTION In SRT/SRS, dedicated treatment planning systems are used for the calculation of the dose distribution. The majority of these systems utilize the standard TMR/OAR formalism for dose calculation as well as they usually neglect any perturbation due to head heterogeneities. The aim of this study is to examine the errors due to head heterogeneities(More)
BACKGROUND It is well recognized that many patients with head and neck carcinoma have problems with food intake and malnutrition. The objective of the current study was to determine the clinical pattern of patients with nonneoplastic stricture of the upper esophagus after radiotherapy for head and neck carcinoma. METHODS A retrospective chart study of 22(More)
The rapid implementation of advanced treatment planning and delivery technologies for radiation therapy has brought new challenges in evaluating the most effective treatment modality. Intensity-modulated radiotherapy (IMRT) using multi-leaf collimators (MLC) and helical tomotherapy (HT) are becoming popular modes of treatment delivery and their application(More)
PURPOSE Biologically based treatment optimisation can be based on the local mean values of the number of clonogenic cells and the cellular radiation response taken over macroscopic tissue voxels. Steep oxygen gradients in tumours may often lead to microscopic distributions of radiation resistance at the cellular level, far beyond the geometrical resolution(More)
An efficient algorithm has been developed to estimate the relative biological effectiveness (RBE) from experimental RBE data and measured single-event energy deposition spectra. As benchmarks for the calculations well established RBE data for crypt cell survival and associated microdosimetric distributions from a number of therapeutic high- and low-LET(More)
PURPOSE To compare the difference in relative biological effectiveness (RBE) between (10)B ions and a (60)Co gamma-ray beam for human melanoma cells using in vitro cell survival based on a clonogenic assay. MATERIALS AND METHODS Cells were irradiated in vitro under aerobic conditions with (60)Co and (10)B ions with different linear energy transfer (LET)(More)
Radiotherapeutic computed tomography is a powerful technique to generate anatomical transversal tomograms of the patient in treatment position by using the therapy beam from the treatment unit. For this purpose the treatment unit has to be equipped with a detector array that can detect the beam transmitted through the patient and a computer that analyzes(More)
  • B K Lind
  • 1999
A case report is described in which the inadvertent placement of a standard intrauterine pressure catheter in a laboring woman caused partial abruptio placentae and disseminated intravascular coagulation. Altering catheter placement technique and giving attention to aspects of placement can help avoid mishaps, and awareness of possible complications can(More)