Exclusive MRI-based tandem and colpostats reconstruction in gynaecological brachytherapy treatment planning

Purpose: According to the GYN GEC-ESTRO Recommendations, MRI is needed with the modality of T2 weighted. CT-MR compatible tandem Plus colpostats (T/C) (Nucletron) is widely used in cervical brachytherapy. The major challenge of MRI is the lack of dummy catheters. Therefore, an additional imaging modality is usually required. One disadvantage of sliced-based reconstruction is that resolution in longitudinal directions can be affected by the slice thickness. The aim of this study is to present a modified T/C applicator in which the catheter visibility is significantly improved. Methods and materials: A modification to the existing T/C applicator has been made available, increasing the cathete…

The necessity of systematic verification of applicator position in brachytherapy treatment of the vaginal cuff

Urethral Dose Limit in Boost Permanent Prostate 125I Seed Implants Based on Biologically Effective Dose Values

Dose Escalation in Permanent Brachytherapy for Prostate Cancer: Preliminary Results

EP-1613: Depth determination of skin cancers treated with superficial barchytherapy: ultrasound vs. histopathology

MRI based treatment planning in gynaecological brachytherapy

Interobserver study of countouringbased on ultrasound image in real-time interactive prostate brachytherapy

A practical MRI-based reconstruction method for a new endocavitary and interstitial gynaecological template

Purpose: There are perineal templates for interstitial implants such as MUPIT and Syed applicators. Their limitations are the intracavitary component deficit and the necessity to use computed tomography (CT) for treatment planning since both applicators are non-magnetic resonance imaging (MRI) compatibles. To overcome these problems, a new template named Template Benidorm (TB) has been recently developed. Titanium needles are usually reconstructed based on their own artifacts, mainly in T1-weighted sequence, using the void on the tip as the needle tip position. Nevertheless, patient tissues surrounding the needles present heterogeneities that complicate the accurate identification of these …

QA of dynamic MLC based on EPID portal dosimetry.

Abstract Purpose Dynamic delivery of intensity modulated beams (dIMRT) requires not only accurate verification of leaf positioning but also a control on the speed of motion. The latter is a parameter that has a major impact on the dose delivered to the patient. Time consumed in quality assurance (QA) procedures is an issue of relevance in any radiotherapy department. Electronic portal imaging dosimetry (EPID) can be very efficient for routine tests. The purpose of this work is to investigate the ability of our EPID for detecting small errors in leaf positioning, and to present our daily QA procedures for dIMRT based on EPID. Methods and materials A Varian 2100 CD Clinac equipped with an 80 …