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Physical wedge as a tool for radiochromic film calibration
In this study the feasibility of using dose gradients produced by a physical wedge (PW) for RCF calibration was investigated. The aim was to establish an efficient and reproducible method for calibrating RCF using a PW. Film strips were used to capture the wedge dose profile for five different exposures and the acquired scans were processed to generate corresponding net optical density wedge profiles. The proposed method was compared to the benchmark calibration, following the guidelines for precise calibration using uniform dose fields. The results of the benchmark comparison presented in this paper showed that using a si...
Source: Zeitschrift fur Medizinische Physik - July 1, 2023 Category: Radiology Authors: Stevan Peci ć Milo š Vićić Ivan Bel ča Strahinja Stojadinovi ć Borko Nid žović Ljubomir Kurij Slobodan Devi ć Source Type: research

Silicone phantoms fabricated with multi-material extrusion 3D printing technology mimicking imaging properties of soft tissues in CT
Z Med Phys. 2023 Jun 26:S0939-3889(23)00076-4. doi: 10.1016/j.zemedi.2023.05.007. Online ahead of print.ABSTRACTRecently, 3D printing has been widely used to fabricate medical imaging phantoms. So far, various rigid 3D printable materials have been investigated for their radiological properties and efficiency in imaging phantom fabrication. However, flexible, soft tissue materials are also needed for imaging phantoms for simulating several clinical scenarios where anatomical deformations is important. Recently, various additive manufacturing technologies have been used to produce anatomical models based on extrusion techni...
Source: Zeitschrift fur Medizinische Physik - June 28, 2023 Category: Radiology Authors: Sepideh Hatamikia Laszlo Jaksa Gernot Kronreif Wolfgang Birkfellner Joachim Kettenbach Martin Buschmann Andrea Lorenz Source Type: research

Impact of log file source and data frequency on accuracy of log file-based patient specific quality assurance
This study compared the dosimetric accuracy of high-frequency linear accelerator (Linac) log files and low-frequency log data stored in the oncology information system (OIS). Thirty patients were included, that were recently treated in the head and neck (HN), brain, and prostate region with volumetric modulated arc therapy (VMAT) and an additional ten patients treated using stereotactic body radiation therapy (SBRT) with 3D-conformal radiotherapy (3D-CRT) technique. Log data containing a single fraction were used to calculate the dose distributions. The dosimetric differences between Linac log files and OIS logs were evalu...
Source: Zeitschrift fur Medizinische Physik - June 26, 2023 Category: Radiology Authors: Akbar Azzi Gerd Heilemann Dietmar Georg Supriyanto Ardjo Pawiro Terry Mart Wolfgang Lechner Source Type: research

Photoacoustic clinical applications: Musculoskeletal and abdominal imaging
This article reviews the motivation, significance, and system configuration of a few ongoing studies of implementing photoacoustic technology in musculoskeletal imaging, abdominal imaging, and interstitial sensing. The review then summarizes the methodologies and latest progress of relevant projects. Finally, we discuss our expectations for the future of translation research in PA imaging.PMID:37365088 | DOI:10.1016/j.zemedi.2023.04.009 (Source: Zeitschrift fur Medizinische Physik)
Source: Zeitschrift fur Medizinische Physik - June 26, 2023 Category: Radiology Authors: Linyu Ni Xueding Wang Guan Xu Source Type: research

Characterization of a new radiochromic film (LD-V1) using mammographic beam qualities
CONCLUSION: We suggest that the dose range be limited to 12 mGy or more to keep the response variation with beam qualities below ±20%. If further measurement is required for reducing the response variation, the dose range should be shifted to a higher dose range.PMID:37365089 | DOI:10.1016/j.zemedi.2023.05.004 (Source: Zeitschrift fur Medizinische Physik)
Source: Zeitschrift fur Medizinische Physik - June 26, 2023 Category: Radiology Authors: Erika Nakajima Hitoshi Sato Source Type: research

Deep learning-based affine medical image registration for multimodal minimal-invasive image-guided interventions - A comparative study on generalizability
Z Med Phys. 2023 Jun 22:S0939-3889(23)00071-5. doi: 10.1016/j.zemedi.2023.05.003. Online ahead of print.ABSTRACTMultimodal image registration is applied in medical image analysis as it allows the integration of complementary data from multiple imaging modalities. In recent years, various neural network-based approaches for medical image registration have been presented in papers, but due to the use of different datasets, a fair comparison is not possible. In this research 20 different neural networks for an affine registration of medical images were implemented. The networks' performance and the networks' generalizability ...
Source: Zeitschrift fur Medizinische Physik - June 24, 2023 Category: Radiology Authors: Anika Strittmatter Lothar R Schad Frank G Z öllner Source Type: research

Multi-stage image registration based on list-mode proton radiographies for small animal proton irradiation: A simulation study
We present a multi-stage and multi-resolution deformable image registration framework for image-guidance at a small animal proton irradiation platform. The framework is based on list-mode proton radiographies acquired at different angles, which are used to deform a 3D treatment planning CT relying on normalized mutual information (NMI) or root mean square error (RMSE) in the projection domain. We utilized a mouse X-ray micro-CT expressed in relative stopping power (RSP), and obtained Monte Carlo simulations of proton images in list-mode for three different treatment sites (brain, head and neck, lung). Rigid transformations...
Source: Zeitschrift fur Medizinische Physik - June 23, 2023 Category: Radiology Authors: Prasannakumar Palaniappan Yana Knudsen Sebastian Meyer Chiara Gianoli Katrin Schn ürle Matthias W ürl Jonathan Bortfeldt Katia Parodi Marco Riboldi Source Type: research