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Dosimetric and Radiobiological Impact of Patient Setup Errors in Intensity-modulated Radiotherapy for Esophageal Cancer.
Technol Cancer Res Treat
January 2025
Department of Radiation Oncology, Cancer Hospital of Shantou University Medical College, Shantou, Guangdong, PR China.
Purpose: To evaluate the impact of patient setup errors on the dosimetry and radiobiological models of intensity-modulated radiotherapy (IMRT) for esophageal cancer.
Methods And Materials: This retrospective study with 56 patients in thermoplastic mask (TM) and vacuum bag (VB) groups utilized real setup-error (RSE) data from cone-beam CT scans to generate simulated setup-error (SSE) data following a normal distribution. The SSE data were applied to simulate all treatment fractions per patient by shifting the plan isocenter and recalculating the dose.
Background: In proton radiotherapy, the steep dose deposition profile near the end of the proton's track, the Bragg peak, ensures a more conformed deposition of dose to the tumor region when compared with conventional radiotherapy while reducing the probability of normal tissue complications. However, uncertainties, as in the proton range, patient geometry, and positioning pose challenges to the precise and secure delivery of the treatment plan (TP). In vivo range determination and dose distribution are pivotal for mitigation of uncertainties, opening the possibility to reduce uncertainty margins and for adaptation of the TP.
View Article and Find Full Text PDFAccuracy Evaluation of Dose Warping Using Deformable Image Registration in Carbon Ion Therapy.
Int J Part Ther
March 2025
Department of Heavy Particle Medical Science, Yamagata University Graduate School of Medical Science, Yamagata, Japan.
Purpose: The study's purpose was to use a simple geometry phantom to validate the deformable image registration (DIR) accuracy and dose warping accuracy in carbon ion radiotherapy (CIRT) and to provide an index for dosimetry in CIRT.
Materials And Methods: We used geometric and anatomical phantoms provided by AAPM TG-132. The DIRs of 3 different settings were performed between reference and translational images for each phantom.
Dosimetry of Continuous Random Motion in High Dose Rate Strontium-90 Plesiotherapy.
Vet Radiol Ultrasound
January 2025
Department of Veterinary Medicine and Surgery, University of Missouri, Columbia, Missouri, USA.
Strontium-90 plesiotherapy delivers high doses of radiation to superficial lesions (<3 mm depth) with excellent sparing of deeper tissues. The sealed-source applicator tip is circular and 8-10 mm in diameter. Larger treatment fields are treated with multiple overlapping fields.
View Article and Find Full Text PDFRadiation decreases bronchial epithelial progenitor function as assessed by organoid formation.
Respir Res
January 2025
Department of Pulmonology, Leiden University Medical Centre (LUMC), Albinusdreef 2, C2-R-062, 2333 ZA, Leiden, The Netherlands.
Objective: Radiation-induced lung injury (RILI) is a serious side-effect of radiotherapy for lung cancer, in which effects on the normal lung epithelium may play a key role. Since these effects are incompletely understood, the aim of the present study was to evaluate the effect of ionizing radiation (IR) on cultured well-differentiated primary bronchial epithelial cells (PBEC) with a focus on cytotoxicity, barrier formation, inflammation and epithelial progenitor function.
Materials And Methods: PBEC were cultured at the Air-Liquid Interface (ALI-PBEC) to allow mucociliary differentiation.
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