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Zeitschrift Fur Medizinische Physik May 2022
Topics: Angiography; Thorium Dioxide
PubMed: 35248451
DOI: 10.1016/j.zemedi.2022.01.004 -
Radiographics : a Review Publication of... 2021The Society for Magnetic Resonance Angiography (SMRA) is a group of researchers and clinicians who are passionate about the benefits of MR angiography (MRA) but...
The Society for Magnetic Resonance Angiography (SMRA) is a group of researchers and clinicians who are passionate about the benefits of MR angiography (MRA) but understand its challenges. Their mission is to study MRA, continually improve and innovate for the benefit of patients, and most important, educate the medical community so they can take full advantage of the benefits of MRA and overcome its challenges. In support of that mission, the authors have created a series of self-learning modules on behalf of the SMRA to demystify MRA protocols and help the reader perform patient-friendly high-quality MRA on a routine basis in clinical practice. RSNA, 2021.
Topics: Angiography, Digital Subtraction; Contrast Media; Humans; Magnetic Resonance Angiography; Sensitivity and Specificity
PubMed: 34197248
DOI: 10.1148/rg.2021200215 -
Neuroradiology Jun 2021Time-of-flight (TOF)-MR angiography (MRA) is an important imaging sequence for the surveillance and analysis of cerebral arteriovenous shunt (AVS), including...
Evaluation of cerebral arteriovenous shunts: a comparison of parallel imaging time-of-flight magnetic resonance angiography (TOF-MRA) and compressed sensing TOF-MRA to digital subtraction angiography.
PURPOSE
Time-of-flight (TOF)-MR angiography (MRA) is an important imaging sequence for the surveillance and analysis of cerebral arteriovenous shunt (AVS), including arteriovenous malformation (AVM) and arteriovenous fistula (AVF). However, this technique has the disadvantage of a relatively long scan time. The aim of this study was to compare diagnostic accuracy between compressed sensing (CS)-TOF and conventional parallel imaging (PI)-TOF-MRA for detecting and characterizing AVS.
METHODS
This study was approved by the institutional review board for human studies. Participants comprised 56 patients who underwent both CS-TOF-MRA and PI-TOF-MRA on a 3-T MR unit with or without cerebral AVS between June 2016 and September 2018. Imaging parameters for both sequences were almost identical, except the acceleration factor of 3× for PI-TOF-MRA and 6.5× for CS-TOF-MRA, and the scan time of 5 min 19 s for PI-TOF-MRA and 2 min 26 s for CS-TOF-MRA. Two neuroradiologists assessed the accuracy of AVS detection on each sequence and analyzed AVS angioarchitecture. Concordance between CS-TOF, PI-TOF, and digital subtraction angiography was calculated using unweighted and weighted kappa statistics.
RESULTS
Both CS-TOF-MRA and PI-TOF-MRA yielded excellent sensitivity and specificity for detecting intracranial AVS (reviewer 1, 97.3%, 94.7%; reviewer 2, 100%, 100%, respectively). Interrater agreement on the angioarchitectural features of intracranial AVS on CS-MRA and PI-MRA was moderate to good.
CONCLUSION
The diagnostic performance of CS-TOF-MRA is comparable to that of PI-TOF-MRA in detecting and classifying AVS with a reduced scan time under 2.5 min.
Topics: Angiography, Digital Subtraction; Arteriovenous Fistula; Humans; Magnetic Resonance Angiography; Prostheses and Implants; Sensitivity and Specificity
PubMed: 33063222
DOI: 10.1007/s00234-020-02581-y -
Clinical Neuroradiology Jun 2022Unruptured intracranial aneurysms (UIAs) at the distal internal carotid artery (ICA) (segments C5-C7) are difficult to accurately display on computed tomography...
PURPOSE
Unruptured intracranial aneurysms (UIAs) at the distal internal carotid artery (ICA) (segments C5-C7) are difficult to accurately display on computed tomography angiography (CTA) due to the influences of bone structures and vessel curvature. We investigated the utility of three-dimensional time-of-flight magnetic resonance angiography (3D-TOF-MRA) at 3.0‑T for the detection of morphologic features compared to digital subtraction angiography (DSA).
METHODS
This retrospective study included 2398 patients between January 2015 and May 2020 who underwent 3D-TOF-MRA and DSA within 3 months. Morphologic features including aneurysm size, neck width, shape and relation to adjacent arteries and other diagnostic parameters were recorded. Three observers blinded to the clinical and DSA results independently analyzed MRA data sets. The statistical difference of each aneurysm-specific variable was performed using χ-tests and multivariate logistic regression analysis.
RESULTS
A total of 551 aneurysms in 514 patients were confirmed at the distal ICA by DSA. Patient-based, aneurysm-based and location-based evaluations with 3D-TOF-MRA yielded high diagnostic accuracy in the detection of target UIAs. The accuracy of displayed morphologic features was 94.9% for size, 97.2% for neck width, 92.6% for shape, and 96.4% for relationship to adjacent vessels. Multivariate logistic regression showed that tiny (P < 0.001) or giant (P = 0.039) size and a lobulated shape (P = 0.006) significantly affected the morphologic assessment on 3D-TOF-MRA.
CONCLUSION
Three-dimensional TOF-MRA can accurately depict and display morphologic features of distal ICA UIAs. Tiny or giant-sized distal ICA aneurysms and with lobulation tend to carry a great risk of misdiagnosis in morphologic assessments.
Topics: Angiography, Digital Subtraction; Cerebral Angiography; Humans; Imaging, Three-Dimensional; Intracranial Aneurysm; Magnetic Resonance Angiography; Retrospective Studies; Sensitivity and Specificity
PubMed: 35072753
DOI: 10.1007/s00062-021-01076-4 -
Journal of Neuroradiology = Journal de... Feb 2023To demonstrate that left radial access for diagnostic cerebral angiography with Extra backup and 4F vertebral catheters is feasible and safe.
PURPOSE
To demonstrate that left radial access for diagnostic cerebral angiography with Extra backup and 4F vertebral catheters is feasible and safe.
MATERIALS AND METHODS
This study is a retrospective review of our prospective database on left radial access for cerebral angiography procedures, using an extra backup catheter associated with a 4Fr vertebral catheter, performed between March and September 2019. Patient demographics, procedural and radiographic metrics as well as clinical data were recorded.
RESULTS
Seventy five patients with mean age of 51...years (range 21...73) underwent 80 cerebral angiographies. An average of four vessels were catheterized and mean fluoroscopy times per subject and vessel were was of 13.9 and 3.3...min, respectively. One patient required crossover to transfemoral access because of radial artery spasm. There were one asymptomatic distal radial artery occlusion and one patient presenting with asymptomatic skin blanching area on the forearm, just proximal to the tip of the sheath, that spontaneously resolved within an hour.
CONCLUSION
Diagnostic cerebral angiography via left radial access is feasible and safe and allows to preserve the right radial access for future neurointerventions while providing more comfort to the right handed patient.
Topics: Humans; Young Adult; Adult; Cerebral Angiography; Radial Artery; Catheters; Arterial Occlusive Diseases; Retrospective Studies
PubMed: 33450347
DOI: 10.1016/j.neurad.2020.10.004 -
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 -
Graefe's Archive For Clinical and... Oct 2023Optical coherence tomography (OCT) is a revolutionary in vivo imaging technology that presents real-time information on ocular structures. Angiography based on OCT,... (Review)
Review
Optical coherence tomography (OCT) is a revolutionary in vivo imaging technology that presents real-time information on ocular structures. Angiography based on OCT, known as optical coherence tomography angiography (OCTA), is a noninvasive and time-saving technique originally utilized for visualizing retinal vasculature. As devices and built-in systems have evolved, high-resolution images with depth-resolved analysis have assisted ophthalmologists in accurately localizing pathology and monitoring disease progression. With the aforementioned advantages, application of OCTA has extended from the posterior to anterior segment. This nascent adaptation showed good delineation of the vasculature in the cornea, conjunctiva, sclera, and iris. Thus, neovascularization of the avascular cornea and hyperemia or ischemic changes involving the conjunctiva, sclera, and iris has become prospective applications for AS-OCTA. Although traditional dye-based angiography is regarded as the gold standard in demonstrating vasculature in the anterior segment, AS-OCTA is expected to be a comparable but more patient-friendly alternative. In its initial stage, AS-OCTA has exhibited great potential in pathology diagnosis, therapeutic evaluation, presurgical planning, and prognosis assessments in anterior segment disorders. In this review of AS-OCTA, we aim to summarize scanning protocols, relevant parameters, and clinical applications as well as limitations and future directions. We are sanguine about its wide application in the future with the development of technology and refinement in built-in systems.
Topics: Humans; Tomography, Optical Coherence; Angiography; Retinal Vessels; Iris; Cornea; Fluorescein Angiography
PubMed: 36862203
DOI: 10.1007/s00417-023-05997-3 -
The Laryngoscope Dec 2023Described herein is an innovative, minimally-invasive technique to harvest temporoparietal fascia flap used in implant-based ear reconstruction for children with...
Described herein is an innovative, minimally-invasive technique to harvest temporoparietal fascia flap used in implant-based ear reconstruction for children with microtia. This technique utilizes a never previously described application of intra-operative Indocyanine Green Angiography to optimize flap viability and minimizing the risk of facial nerve injury. Laryngoscope, 133:3615-3618, 2023.
Topics: Child; Humans; Indocyanine Green; Congenital Microtia; Plastic Surgery Procedures; Surgical Flaps; Angiography
PubMed: 37218680
DOI: 10.1002/lary.30759 -
Interventional Neuroradiology : Journal... Dec 2022The vascular anatomy of orbit is highly complex, and the main blood supply to the orbit is via the ophthalmic artery, which is a branch of the internal carotid artery....
BACKGROUND
The vascular anatomy of orbit is highly complex, and the main blood supply to the orbit is via the ophthalmic artery, which is a branch of the internal carotid artery. The purpose of this study was to determine the morphometry of the ophthalmic artery and its branches by superselective angiography in a large series of pediatric patients.
METHODS
We evaluated 134 angiographies performed on children with intraocular retinoblastoma undergoing intra-arterial chemotherapy. The origin, diameter, and angiographic visibility percentages of the ophthalmic artery and its branches were examined according to age group and sex.
RESULTS
The ophthalmic artery originated 97.8% from the internal carotid artery and 2.2% from the middle meningeal artery. The mean diameter of ophthalmic artery was measured 0.76 ± 0.14 mm in girls, 0.80 ± 0.15 mm in boys and 0.79 ± 0.15 mm in general. The posterior ciliary, lacrimal, inferior muscular, and anterior ethmoidal arteries had a higher angiographic visibility percentages (> 85%) than the other OA branches. Only the diameter of the dorsal nasal artery showed a significant correlation with age. The supratrochlear and posterior ciliary arteries showed statistically significant relationship with sex.
CONCLUSIONS
Present study will make a substantial contribution to the pediatric literature about the ophthalmic artery and its branches. A better understanding of ophthalmic artery morphology can help surgeons and neurointerventional radiologists to avoid possible severe complications during embolization, intra-arterial chemotherapy, cosmetic procedures, endonasal and orbital surgeries.
Topics: Male; Female; Humans; Child; Ophthalmic Artery; Angiography; Carotid Artery, Internal; Meningeal Arteries; Retinal Neoplasms
PubMed: 35317633
DOI: 10.1177/15910199221067664 -
European Radiology Jun 2022• TOF MRA is very important in the evaluation of cerebrovascular stenosis, and a novel evaluation system can further enhance its strengths.• This evaluation system...
• TOF MRA is very important in the evaluation of cerebrovascular stenosis, and a novel evaluation system can further enhance its strengths.• This evaluation system is more accurate based on the fact that cerebral vascular stenosis alters hemodynamics and leads to different imaging presentations.
Topics: Arteries; Cerebral Angiography; Constriction, Pathologic; Humans; Magnetic Resonance Angiography
PubMed: 35076760
DOI: 10.1007/s00330-021-08521-5