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JACC. Cardiovascular Imaging Sep 2020
Topics: Coronary Angiography; Humans; Plaque, Atherosclerotic; Predictive Value of Tests
PubMed: 32912473
DOI: 10.1016/j.jcmg.2020.02.009 -
Nihon Hoshasen Gijutsu Gakkai Zasshi 2022
Topics: Magnetic Resonance Angiography; Contrast Media; Sensitivity and Specificity
PubMed: 36261357
DOI: 10.6009/jjrt.2022-2085 -
Circulation. Cardiovascular Imaging Sep 2019
Topics: Angiography; Computed Tomography Angiography; Heart; Point-of-Care Systems; Tomography, X-Ray Computed
PubMed: 31505946
DOI: 10.1161/CIRCIMAGING.119.009851 -
The Neuroradiology Journal Jun 2022Among the varied causes of pulsatile tinnitus, the condition that can cause severe mortality and morbidity is a cranial dural arteriovenous fistula (cDAVF). This study...
BACKGROUND
Among the varied causes of pulsatile tinnitus, the condition that can cause severe mortality and morbidity is a cranial dural arteriovenous fistula (cDAVF). This study aimed to assess the diagnostic accuracy of the dilated middle meningeal artery on three-dimensional time-of-flight magnetic resonance angiography in cranial dural arteriovenous fistula and to identify other feeders that can aid in the detection of these lesions.
METHOD
Magnetic resonance angiography and digital subtraction angiography data of all patients with cranial dural arteriovenous fistula treated in a single tertiary referral center between 2007-2020 were included. The middle meningeal artery and other feeders recorded from digital subtraction angiography were assessed on magnetic resonance angiography.
RESULTS
The overall agreement between readers in identifying the dilated middle meningeal artery was substantial (κ = 0.878, 95% confidence interval: 0.775-0.982). The dilated middle meningeal artery indicated the presence of a cranial dural arteriovenous fistula with a sensitivity of 79.49% (95% confidence interval: 66.81-92.16), specificity of 100% (95% confidence interval: 100.00-100.00), and negative predictive value of 94.56% (95% confidence interval: 90.89-98.02). An area under the curve of 0.8341 was observed for the ipsilateral middle meningeal artery, with a sensitivity of 92.2% and a specificity of 75.0% at a cut-off of 0.30 mm for identifying a cranial dural arteriovenous fistula. Of 73 other feeders, the occipital, meningohypophyseal trunk, ascending pharyngeal, and posterior meningeal arteries contributed to a large proportion visualized on magnetic resonance angiography (83.6% (41/49)).
CONCLUSION
The dilated middle meningeal artery sign is useful for identifying a cranial dural arteriovenous fistula. Dilatation of the occipital and ascending pharyngeal arteries and meningohypophyseal trunk should be assessed to facilitate the detection of a cranial dural arteriovenous fistula, particularly in the transverse-sigmoid and petrous regions.
Topics: Angiography, Digital Subtraction; Central Nervous System Vascular Malformations; Humans; Magnetic Resonance Angiography; Meningeal Arteries; Skull
PubMed: 34449286
DOI: 10.1177/19714009211041530 -
Ultrasound in Medicine & Biology Oct 2020Cancerous tumor growth is associated with the development of tortuous, chaotic microvasculature, and this aberrant microvascular morphology can act as a biomarker of... (Review)
Review
Cancerous tumor growth is associated with the development of tortuous, chaotic microvasculature, and this aberrant microvascular morphology can act as a biomarker of malignant disease. Acoustic angiography is a contrast-enhanced ultrasound technique that relies on superharmonic imaging to form high-resolution 3-D maps of the microvasculature. To date, acoustic angiography has been performed with dual-element transducers that can achieve high contrast-to-tissue ratio and resolution in pre-clinical small animal models. In this review, we first describe the development of acoustic angiography, including the principle, transducer design, and optimization of superharmonic imaging techniques. We then detail several preclinical applications of this microvascular imaging method, as well as the current and future development of acoustic angiography as a pre-clinical and clinical diagnostic tool.
Topics: Acoustics; Angiography; Animals; Contrast Media; Forecasting; Humans; Microvessels; Neoplasms; Neovascularization, Pathologic; Ultrasonography
PubMed: 32703659
DOI: 10.1016/j.ultrasmedbio.2020.06.009 -
Eye (London, England) May 2021
Topics: Caves; Choroid; Fluorescein Angiography; Humans
PubMed: 32636496
DOI: 10.1038/s41433-020-1074-y -
Journal of the American College of... Nov 2022
Topics: Humans; Myocardial Ischemia; Coronary Artery Disease; Angiography
PubMed: 36423993
DOI: 10.1016/j.jacc.2022.10.012 -
Cardiovascular and Interventional... Mar 2021The presence of metal implants may reduce angiographic image quality due to automated beam adjustments. Digital variance angiography (DVA) is reported to be superior to... (Observational Study)
Observational Study
PURPOSE
The presence of metal implants may reduce angiographic image quality due to automated beam adjustments. Digital variance angiography (DVA) is reported to be superior to digital subtraction angiography (DSA) with increased contrast-to-noise ratio (CNR) and better image quality. The aim of the study was to evaluate whether DVA could counterbalance the image quality impairment of lower-limb angiographies with metal implants.
MATERIALS AND METHODS
From November 2019 to January 2020, 85 raw lower-limb iodine contrast angiograms of 12 patients with metal implants were processed retrospectively with DVA analyses. For objective comparison, CNR of DSA and DVA images was calculated and the ratio CNR/CNR was determined. Visual image quality was evaluated in a paired comparison and by a five-grade Likert scale by three experienced radiologists.
RESULTS
The CNR was calculated and compared in 1252 regions of interest in 37 image pairs containing metal implants. The median ratio of CNR/CNR was 1.84 with an interquartile range of 1.35-2.32. Paired comparison resulted in 84.5% in favour of DVA with an interrater agreement of 83.2% (Fleiss κ 0.454, p < 0.001). The overall image quality scores for DSA and DVA were 3.64 ± 0.08 and 4.43 ± 0.06, respectively (p < 0.001, Wilcoxon signed-rank test) with consistently higher individual ratings for DVA.
CONCLUSION
Our small-sample pilot study shows that DVA provides significantly improved image quality in lower-limb angiography with metal implants, compared to DSA imaging. The improved CNR suggest that this approach could reduce radiation exposure for lower-limb angiography with metal implants.
LEVEL OF EVIDENCE
Level 4, case studies.
Topics: Aged; Aged, 80 and over; Angiography, Digital Subtraction; Artifacts; Contrast Media; Female; Humans; Image Processing, Computer-Assisted; Leg; Male; Metals; Pilot Projects; Prostheses and Implants; Retrospective Studies
PubMed: 33145701
DOI: 10.1007/s00270-020-02697-x -
Journal of Interventional Cardiology 2020Percutaneous coronary intervention exposes patient and staff to ionizing radiation. Although staff only receive a small fraction of patient dose through scatter... (Review)
Review
BACKGROUND
Percutaneous coronary intervention exposes patient and staff to ionizing radiation. Although staff only receive a small fraction of patient dose through scatter radiation, there are concerns about the potential health effects of repeated exposure. Minimizing both patient and occupational exposure is needed.
OBJECTIVE
This article investigates patient and operator X-ray exposure over time in coronary intervention in relation to upgraded X-ray equipment, improved shielding, and enhanced operator awareness.
MATERIALS AND METHODS
Data regarding irradiation time, patient dose, and patient characteristics were extracted from the Norwegian Registry for Invasive Cardiology (NORIC) for procedures performed from 2013 to mid-2019. Personal operator dosimetry records were provided by the Norwegian Radiation and Nuclear Safety Authority. Improved operator shielding and awareness measures were introduced in 2018.
RESULTS
In the period 2013 through June 2019, 21499 procedures were recorded in our institution. Mean dose area product (DAP) for coronary angiography decreased 37% from 2981 Gy·m in 2013 to 1891 Gy·m in 2019 ( < 0.001). For coronary intervention, DAP decreased 39% from 8358 Gy·m to 5055 Gy·m. Personal dosimetry data indicate a 70% reduction in operator dose per procedure in 2019 compared to 2013. The most pronounced reduction occurred after improved radiation protection measures were implemented in 2018 (-48%).
CONCLUSIONS
This study shows a temporal trend towards considerable reduction in X-ray doses received by the patient and operator during cardiac catheterization. Upgraded X-ray equipment, improved shielding, and enhanced operator awareness are likely contributors to this development.
Topics: Coronary Angiography; Humans; Occupational Exposure; Percutaneous Coronary Intervention; Radiation Exposure; Radiologic Health
PubMed: 32934609
DOI: 10.1155/2020/9602942 -
Tomography (Ann Arbor, Mich.) Sep 2022Gastrointestinal bleeding is a potentially life-threatening abdominal emergency that remains a common cause of hospitalisation. Although 80-85% of cases of... (Review)
Review
Gastrointestinal bleeding is a potentially life-threatening abdominal emergency that remains a common cause of hospitalisation. Although 80-85% of cases of gastrointestinal bleeding resolve spontaneously, it can result in massive haemorrhage and death. The presentation of gastrointestinal bleeding can range from asymptomatic or mildly ill patients requiring only conservative treatments to severely ill patients requiring immediate intervention. Identifying the source of the bleeding can be difficult due to the wide range of potential causes, the length of the gastrointestinal tract and the intermittent nature of the bleeding. The diagnostic and therapeutic approach is fully dependent on the nature of the bleeding and the patient's haemodynamic status. Radiologists should be aware of the appropriate uses of computed tomography angiography and other imaging modalities in patients with acute gastrointestinal bleeding, as well as the semiotics of bleeding and diagnostic pitfalls in order to appropriately diagnose and manage these patients. The learning objective of this review is to illustrate the computed tomography angiography technique, including the potential role of dual-energy computed tomography angiography, also highlighting the tips and tricks to identify the most common and uncommon features of acute gastrointestinal bleeding and its obscure form.
Topics: Humans; Computed Tomography Angiography; Angiography; Gastrointestinal Hemorrhage; Tomography, X-Ray Computed; Acute Disease
PubMed: 36287797
DOI: 10.3390/tomography8050198