Publications by authors named "Loiseau Cedric"
Background: Most radiotherapy structures contoured on CT scans during IMRT planning are defined by the ICRU, forming part of standard practice. Associated dose-volume constraints serve as parameters for dose computation algorithms to produce optimized dose maps. On the ground, however, physicists/dosimetrists routinely delineate auxiliary "non-standard" radiotherapy structures (nsRS).
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- The study investigates the variability in delineation of target volumes and organs at risk in radiation therapy, highlighting the uncertainty and lack of standardized methods in interobserver variability (IOV) studies.
- A systematic review of 66 published IOV studies from 2018-2021 reveals issues like the independent study of organs at risk, absence of defined gold standards, and inconsistent results in key metrics like the Dice similarity coefficient.
- To improve future IOV studies, the authors recommend standardizing methodologies and clearly defining measurements and reference standards to ensure better reproducibility and reliability of results.
Purpose: This retrospective study aims to assess factors associated with the occurrence of toxicity after brachytherapy (BT), as boost after external beam radiotherapy (EBRT) for treatment of invasive cervix carcinoma.
Methods And Materials: All consecutive patients diagnosed with cervical carcinoma, and treated with concurrent radiochemotherapy from August 2017 to January 2020 were retrospectively included. An isodose conformation index (ICI) was developed to assess the percentage of the prescription isodose contained within the intermediate risk clinical target volume (IR-CTV).
Background: Stereotactic irradiation (SBRT) is a standard of care for inoperable stage I lung cancer and brain oligometastases from lung cancer but is controversial for extracranial oligometastases. We assessed outcomes of lung cancer patients with extracranial metastases in oligometastatic, oligorecurrent, oligopersistent and oligoprogressive settings ("oligometastatic spectrum") under strategies using SBRT +/- systemic treatments.
Methods: A retrospective multicentric study of consecutive lung cancer adult patients with 1-5 extracranial metastases treated with SBRT was conducted.
Purpose: Correct tandem implantation for cervix cancer intracavitary brachytherapy may be challenging. We investigated whether suboptimal implantation can be related to patient and disease characteristics and may result in subsequent underutilization of brachytherapy in cervical cancer.
Methods And Materials: Consecutive cervix cancer patients referred for intracavitary brachytherapy after external beam radiation therapy performed in several general hospitals from 2013 to 2017 were included.
Purpose: The purpose of this study was to analyze the detector responses in non-equilibrium small photon fields.
Methods: Five detectors (PTW 31014 ionization chamber, PTW 60016, PTW 60017 and Sun Nuclear EDGE diodes and PTW 60003 diamond detector) and one passive dosimeter (Harshaw micro-LiF) as well as a 1000MU/min CyberKnife were modeled with the PENELOPE Monte Carlo code. Field factors, [Formula: see text] were calculated and perturbations due to volume averaging effect, active material effect and coating effect were quantified for the five detectors and passive dosimeter.
Context: In patients with differentiated thyroid carcinoma, postablation (131)I scintigraphy aims to detect residual neck disease and distant metastases, usually found in lungs and bones. New hybrid single-photon emission computed tomography/computed tomography (SPECT-CT) cameras that permit functional and anatomical image fusion may improve its clinical relevance.
Objective: Our objective was to test the added value of neck and thorax SPECT-spiral CT to whole-body scan (WBS) in postablation (131)I scintigraphy.