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This report reviews the image acquisition and reconstruction characteristics of C-arm Cone Beam Computed Tomography (C-arm CBCT) systems and provides guidance on quality control of C-arm systems with this volumetric imaging capability. The concepts of 3D image reconstruction, geometric calibration, image quality, and dosimetry covered in this report are also pertinent to CBCT for Image-Guided Radiation Therapy (IGRT). However, IGRT systems introduce a number of additional considerations, such as geometric alignment of the imaging at treatment isocenter, which are beyond the scope of the charge to the task group and the report. Section 1 provides an introduction to C-arm CBCT systems and reviews a variety of clinical applications. Section 2 briefly presents nomenclature specific or unique to these systems. A short review of C-arm fluoroscopy quality control (QC) in relation to 3D C-arm imaging is given in Section 3. Section 4 discusses system calibration, including geometric calibration and uniformity calibration. A review of the unique approaches and challenges to 3D reconstruction of data sets acquired by C-arm CBCT systems is give in Section 5. Sections 6 and 7 go in greater depth to address the performance assessment of C-arm CBCT units. First, Section 6 describes testing approaches and phantoms that may be used to evaluate image quality (spatial resolution and image noise and artifacts) and identifies several factors that affect image quality. Section 7 describes both free-in-air and in-phantom approaches to evaluating radiation dose indices. The methodologies described for assessing image quality and radiation dose may be used for annual constancy assessment and comparisons among different systems to help medical physicists determine when a system is not operating as expected. Baseline measurements taken either at installation or after a full preventative maintenance service call can also provide valuable data to help determine whether the performance of the system is acceptable. Collecting image quality and radiation dose data on existing phantoms used for CT image quality and radiation dose assessment, or on newly developed phantoms, will inform the development of performance criteria and standards. Phantom images are also useful for identifying and evaluating artifacts. In particular, comparing baseline data with those from current phantom images can reveal the need for system calibration before image artifacts are detected in clinical practice. Examples of artifacts are provided in Sections 4, 5, and 6.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11584023 | PMC |
http://dx.doi.org/10.1002/mp.16245 | DOI Listing |
J Neural Eng
December 2024
University of California San Francisco, 513 Parnassus Avenue, S362, SAN FRANCISCO, San Francisco, 94143, CHINA.
Objective: Electroencephalography (EEG) and Magnetoencephalography (MEG) are widely used non-invasive techniques in clinical and cognitive neuroscience. However, low spatial resolution measurements, partial brain coverage by some sensor arrays, as well as noisy sensors could result in distorted sensor topographies resulting in inaccurate reconstructions of underlying brain dynamics. Solving these problems has been a challenging task, This paper proposes a robust framework based on electromagnetic source imaging for interpolation of unknown or poor quality EEG/MEG measurements.
View Article and Find Full Text PDFAm J Trop Med Hyg
December 2024
Department of Infectious Diseases, The First Affiliated Hospital of Bengbu Medical College, Bengbu, China.
Typhoid fever is a human-specific disease caused by subspecies of Salmonella enterica (Salmonella Typhi). It spreads through ingestion of contaminated food or water and is diagnosed through blood culture or bone marrow culture. It typically presents as an intestinal infection, with a few patients developing severe disseminated infections.
View Article and Find Full Text PDFBull Menninger Clin
December 2024
Emergency medicine physician, NYC Health + Hospitals, Department of Emergency Medicine.
This review focuses on chronic pediatric skin conditions-vitiligo, psoriasis, alopecia, and eczema-and their profound psychosocial impact on children and adolescents. Currently, a comprehensive comparative analysis across these conditions is absent, and comparisons between diverse psychosocial measures are lacking. This review aims to bridge that gap through a systematic review analyzing studies from PubMed and Embase up to April 2023 according to PRISMA.
View Article and Find Full Text PDFVopr Kurortol Fizioter Lech Fiz Kult
December 2024
S.I. Spasokukotsky Moscow Centre for Research and Practice in Medical Rehabilitation, Restorative and Sports Medicine, Moscow, Russia.
Unlabelled: Post-stroke cognitive impairments are widespread and significantly reduce the quality of life and rehabilitation prognosis of patients. Clinical observations show a serious variability of cognitive impairments in patients after acute cerebrovascular accident. Thus, the classification of above mentioned disorders, based on which it would be possible to determine the order of individualization of a cognitive rehabilitation program, is currently not available in literature.
View Article and Find Full Text PDFAbdom Radiol (NY)
December 2024
Cincinnati Children's Hospital Medical Center, Cincinnati, USA.
Objectives: Implementation of diffusion-weighted imaging (DWI) for abdominal imaging in children has challenges due to motion artifacts exacerbated by long acquisition times. We aimed to compare acquisition time and image quality between conventional DWI and multi-band (MB) DWI of the liver in children and young adults.
Methods: Clinical MRI exams from May 2023 to January 2024 were reviewed, including four DWI sequences: respiratory-triggered (RTr, clinical standard), free-breathing (FB), MB-DWI with shift factor 1 (MBsf1), and MB-DWI with shift factor 2 (MBsf2).
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