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Feasibility of volumetric-modulated arc therapy gating for cardiac radioablation using real-time ECG signal acquisition and a dynamic phantom.
Med Phys
December 2024
Department of Physics, The Verspeeten Family Cancer Centre, London, Ontario, Canada.
Background: Stereotactic arrythmia radioablation (STAR) is a noninvasive technique to treat ventricular tachycardia (VT). Management of cardiorespiratory motion plays an essential role in VT-STAR treatments to improve treatment outcomes by reducing positional uncertainties and increasing dose conformality. Use of an electrocardiogram (ECG) signal, acquired in real-time, as a surrogate to gate the beam has the potential to fulfil that intent.
View Article and Find Full Text PDFLight-guided dynamic phantom to mimic microvasculature for biomedical applications: an exploration for pulse oximeter.
J Biomed Opt
June 2024
Tyndall National Institute, Biophotonics@Tyndall, Cork, Ireland.
Significance: Dynamic phantoms capable of changing optical properties by control are essential for standardizing and calibrating spectroscopy systems such as the pulse oximeter. However, current liquid dynamic phantoms containing human blood have a short shelf life and require complex experimental setups. Some solid dynamic phantoms are influenced by the angular-dependent performance of the liquid crystal display (LCD), some have a low spatial resolution, and some have slow control of optical properties.
View Article and Find Full Text PDFMulti-institutional experience treating patients with cardiac devices on a 1.5 Tesla magnetic resonance-linear accelerator and workflow development for thoracic treatments.
Phys Imaging Radiat Oncol
October 2024
Department of Radiotherapy, University Medical Center Utrecht, Utrecht, The Netherlands.
Background And Purpose: Patients with cardiac implantable electronic devices (CIED patients) are often ineligible for online magnetic resonance-guided radiotherapy (MRgRT), most likely due to the absence of established guidelines. Existing radiotherapy (RT) and magnetic resonance imaging (MRI) guidelines offer an opportunity to construct MRgRT protocols, promoting equitable access. Our objective was to present such a workflow, share multi-institutional experiences treating CIED patients with MRgRT on a 1.
View Article and Find Full Text PDFInvestigating the effects of table movement and sag on optical surrogate-driven respiratory-guided computed tomography.
J Appl Clin Med Phys
November 2024
Department of Radiation Oncology, Universitätsklinikum Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Universitätsstraße 27, Erlangen, Germany.
Purpose: Respiratory-guided computed tomography (CT) typically employs breathing motion surrogates to feed image reconstruction or visual breathing coaching. Our study aimed to assess the impact of table movements and table sag on the breathing curves recorded in four-dimensional (4D) CT and deep-inspiration breath-hold (DIBH) CT.
Methods: For breathing curve measurements, static and dynamic phantom scenarios were used.
Fabrication of Tuneable Tissue-Mimicking Phantom for Optical Methods.
Adv Exp Med Biol
October 2024
Biomedical Optics Research Laboratory (BORL), Department of Neonatology, University of Zurich and University Hospital Zurich, Zürich, Switzerland.
Article Synopsis
- Tissue mimicking optical phantoms are essential for testing near-infrared imaging devices, but existing models lack complexity and variability in their properties.
- The project focused on creating a novel phantom that features dynamic internal shapes and adjustable optical properties, made from silicone and a water-soluble material.
- The resulting phantom successfully demonstrated accurate imaging and changes in light intensity upon testing with frequency domain near-infrared spectroscopy and time domain optical tomography.
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