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Journal of Medical Physics
Scopus
ISSN 0971-6203 · Wolters Kluwer Medknow Publications · 897 artikel di indeks
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Artikel Jurnal
Feasibility of Using Machine Performance Check-enhanced Couch Check as a Daily Surrogate for Multisphere Winston–Lutz Testing in Single-isocenter Multitarget Stereotactic Radiosurgery
Single-isocenter multitarget (SIMT) stereotactic radiosurgery (SRS) requires submillimeter geometric accuracy. Although Winston–Lutz (WL) testing remains the stereotactic standard, it is time-intensive. This study evaluated whether Varian’s machine performance check (MPC)-enhanced couch check can…
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Artikel Jurnal
Monte Carlo-based Design and Comparative Evaluation of Intraoperative Radiotherapy Disks
Background: Intraoperative radiotherapy (IORT) is a technique in which a single high radiation dose (10–20 Gy) is delivered directly to the tumor site during surgery. As this procedure is performed in the operating room, effective protection of the surrounding healthy tissues is of paramount…
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Comparative Study on Effective Dose and Cancer Risk in Dual-tracer Hybrid Imaging – International Commission on Radiological Protection and Personalized Models
Purpose: Dual-tracer hybrid imaging is used for concurrent evaluation of two distinct molecular biomarkers, enhancing diagnostic capabilities. However, concerns about increased radiation exposure to patients arise with this technique. This study investigates the representative radiation doses and…
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Comparative Study of Spinal Cord Toxicity from Dose Per Fraction Delivered to Cervical Spinal Cord in Head-and-neck Cancers by Volumetric-modulated Arc Therapy with Simultaneous Integrated Boost versus Three-dimensional Conformal Radiotherapy in a Murine Model
Aim: To assess and compare the radiation-induced effects on the spinal cord of rats following fractionated irradiation with doses of 1.36 Gy and 2.0 Gy per fraction. Materials and Methods: The risk of radiation-induced myelopathy and spinal cord tolerance represent the major dose-limiting factors…
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Clinical Implementation and Accuracy Evaluation of a Novel Intrafraction Cone-beam Computed Tomography Technique for Stereotactic Radiosurgery and Radiotherapy
Purpose: To evaluate the clinical implementation and setup accuracy of real-time intrafraction cone-beam computed tomography imaging during stereotactic radiosurgery and stereotactic radiotherapy. Materials and Methods: Ten patients treated with intracranial SRS/SRT were retrospectively analyzed…
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Dosimetric Comparison of Sequential Boost versus Simultaneous Integrated Boost Intensity-modulated Delivery Techniques in Left-sided Breast Cancer Radiotherapy: A Planning Study
Purpose: This research compares the dosimetric characteristics of sequential boost (SB) and simultaneous integrated boost (SIB) techniques using intensity-modulated delivery techniques for breast radiotherapy in left-sided breast cancer patients following breast-conserving surgery (BCS). Materials…
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Artikel Jurnal
A Comprehensive Dosimetric Evaluation and Performance Validation of the Newly Introduced HyperSight™ Cone-beam Computed Tomography System in India – Is It Now Feasible to Eliminate the Intermediate Step in Adaptive Radiotherapy Planning?: A Phantom Study
Purpose: Cone-beam computed tomography (CBCT) is integral to modern adaptive radiotherapy (ART) but is often limited by a small field of view, longer acquisition times, and inferior image quality compared with planning CT. Consequently, ART plan optimization and calculations are typically performed…
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Artikel Jurnal
Magnetic Resonance Imaging-based Prostate Cancer Diagnosis Using Principal Component Analysis and Machine Learning Algorithms
Purpose: Prostate cancer is a leading cause of cancer-related mortality among men, necessitating accurate and early diagnostic methods. This study evaluates the effectiveness of principal component analysis (PCA) combined with machine learning (ML) for classifying benign and malignant prostate…
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Artikel Jurnal
Impact of Grid Size on Dose Calculations for Cranial Tumors
Purpose: The purpose of this study was to evaluate the impact of calculation grid size on dose calculations for multiple cranial tumor types using Monte Carlo (MC) calculation, comparing different grid settings. Methods: This cross-sectional study optimized 110 treatment plans using Elements…
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Artikel Jurnal
An Analysis of Quality Assurance for Intensity-modulated Radiation Therapy and Volumetric Modulated Arc Therapy Treatment Plans Using Two Dosimetric Methods: The arcCHECK System and EPIbeam Based Dosimetric Approach
Aim: The current study is to assess and compare the performance of an electronic portal imaging device (EPID)-based dosimetry system electronic portal imaging beam (EPIbeam) and a three-dimensional (3D) diode array system (ArcCHECK) using various gamma criteria (3%/3 mm, 2%/2 mm, 3%/2 mm and 1%/1…
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Artikel Jurnal
A Digital Imaging and Communications in Medicine-based Collision Prediction System with an Angle Optimization Algorithm for Electron Beam Therapy
Purpose: The purpose of this study was to develop and validate a Digital Imaging and Communications in Medicine (DICOM)-based collision prediction system for electron beam therapy. This system enables a quantitative pretreatment assessment of mechanical interference between the electron applicator…
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Artikel Jurnal
Investigating Image Distortion and Its Impact on Material Quantification in Photon-counting Computed Tomography
Background: Photon-counting computed tomography (PCCT) enables simultaneous spatial and spectral imaging for improved material discrimination. However, inaccuracies in scanner geometric calibration can introduce reconstruction distortions that degrade both image quality and spectral fidelity…
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Artikel Jurnal
Impact of Volumetric Modulated Arc Therapy Control Point Discretisation on Dosimetry: A Comparative Evaluation of Two Treatment Planning Systems
Aim: The aim of the study was to investigate the dose calculation accuracy of volumetric modulated arc therapy (VMAT) control point (CP) discretisation approaches in Pinnacle and RayStation treatment planning systems (TPSs). Methods: The 6MV beam model for Elekta linear accelerator with Agility…
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Artikel Jurnal
Development of an End-to-end Phantom and Procedure for Computed Tomography and Cone-beam Computed Tomography-guided Online Adaptive Radiotherapy
Purpose: The purpose of this study was to develop an end-to-end (E2E) testing procedure to verify in-room computed tomography (CT)-on-rails and cone-beam CT (CBCT)-guided online adaptive radiation therapy (OART) workflows. Materials and Methods: A water tank-type lung phantom was developed to mimic…
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Artikel Jurnal
Optimizing Chest Computed Tomography Imaging Protocols: A Narrative Review on Dose Reduction and Diagnostic Efficacy
Background: The worldwide deployment of chest computed tomography (CT) has increased substantially across cancer-related, respiratory and cardiac applications, leading to increasing aggregate radiation burden and substantially intercenter variability in radiation dose management strategies…
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Artikel Jurnal
Three-dimensional Hierarchically Dense U-net Architecture for Knowledge-based Dose Prediction in Head and Neck Radiotherapy
Purpose: Our objective is to investigate a novel knowledge-based planning model that utilizes the newly developed dense U-Net architecture to predict three-dimensional (3D) dose distributions in patients with head and neck cancer. Materials and Methods: We utilized data published by the American…
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Artikel Jurnal
Influence of Setup Uncertainties: Optimizing Clinical Target Volume-to-planning Target Volume Margins in Total Marrow and Lymphoid Irradiation
Background: Total Marrow and Lymphoid Irradiation (TMLI) is an advanced alternative to traditional Total Body Irradiation, aiming to reduce toxicities while maintaining treatment efficacy. Aim: This study evaluates setup uncertainties and their impact on clinical target volume (CTV) to planning…
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Artikel Jurnal
MIVMAT: A New Comprehensive Modulation Index for Volumetric Modulated Arc Therapy Based on Three Key Variables
Objective: This study introduces a novel modulation index for volumetric modulated arc therapy (MIVMAT), which simultaneously accounts for the combined effects of three key delivery variables. The index is validated for its ability to predict gamma pass rates (GPRs) across two different linear…
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Artikel Jurnal
Comparative Evaluation of Curve-fitting Techniques for Electronic Portal Imaging Device-based Multileaf Collimator Picket Fence Analysis
Purpose: The primary objective of this study was to identify the most suitable curve-fitting method for picket fence analysis by comparing commonly used mathematical fitting approaches with film-based reference measurements. Materials and Methods: A picket fence test was planned on an Elekta…
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Artikel Jurnal
Relationship between Water-equivalent Diameter, Computed Tomography Dose Indices, and Image Noise in Pediatric Head Computed Tomography Under Active and Inactive Tube Current Modulation
Purpose: This study investigated the relationships among water-equivalent diameter (Dw), volume computed tomography dose index (CTDIvol), size-specific dose estimate (SSDE), and image noise in pediatric head computed tomography (CT) under active and inactive tube current modulation (TCM). Subjects…