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Igaku Butsuri : Nihon Igaku Butsuri... 2021IVR-CT was developed at Aichi Cancer Center (Japan) in 1992 and is now in use worldwide. It was developed initially for the purpose of performing CT more easily during... (Review)
Review
IVR-CT was developed at Aichi Cancer Center (Japan) in 1992 and is now in use worldwide. It was developed initially for the purpose of performing CT more easily during arteriography, but also during non-vascular IR procedures such as biopsy and drainage. Four-detector-row IVR-MDCT was introduced to Shizuoka Cancer center in 2002, which was upgraded to 320-Row IVR-ADCT (320-IVR-CT) by 2013. Although we performed an initial investigation into the efficacy of 320 IVR-CT for vascular intervention, the direct MPR method using volume scanning is predominant in the field of non-vascular intervention. In this review, we describe the history of IVR-CT, report the efficacy of 320-IVR-CT for vascular and non-vascular intervention, and report our experiences.
Topics: Angiography; Humans; Japan
PubMed: 34744140
DOI: 10.11323/jjmp.41.3_92 -
Journal of Nuclear Medicine : Official... Jun 1981
Topics: Angiography; Computers; Forecasting; Humans; Magnetic Resonance Spectroscopy; Radionuclide Imaging
PubMed: 7229720
DOI: No ID Found -
Postgraduate Medical Journal Nov 1959
Topics: Angiography; Aortography; Humans
PubMed: 13851774
DOI: 10.1136/pgmj.35.409.620 -
Whole-brain arteriography and venography: Using improved velocity-selective saturation pulse trains.Magnetic Resonance in Medicine Apr 2018To develop velocity-selective (VS) MR angiography (MRA) protocols for arteriography and venography with whole-brain coverage.
PURPOSE
To develop velocity-selective (VS) MR angiography (MRA) protocols for arteriography and venography with whole-brain coverage.
METHODS
Tissue suppression using velocity-selective saturation (VSS) pulse trains is sensitive to radiofrequency field (B +) inhomogeneity. To reduce its sensitivity, we replaced the low-flip-angle hard pulses in the VSS pulse train with optimal composite (OCP) pulses. Additionally, new pulse sequences for arteriography and venography were developed by placing spatially selective inversion pulses with a delay to null signals from either venous or arterial blood. The VS MRA techniques were compared to the time-of-flight (TOF) MRA in six healthy subjects and two patients at 3T.
RESULTS
More uniform suppression of stationary tissue was observed when the hard pulses were replaced by OCP pulses in the VSS pulse trains, which improved contrast ratios between blood vessels and tissue background for both arteries (0.87 vs. 0.77) and veins (0.80 vs. 0.59). Both arteriograms and venograms depicted all major cervical and intracranial arteries and veins, respectively. Compared to TOF MRA, VS MRA not only offers larger spatial coverage but also depicts more small vessels. Initial clinical feasibility was shown in two patients with comparisons to TOF protocols.
CONCLUSION
Noncontrast-enhanced whole-brain arteriography and venography can be obtained without losing sensitivity to small vessel detection. Magn Reson Med 79:2014-2023, 2018. © 2017 International Society for Magnetic Resonance in Medicine.
Topics: Adult; Angiography; Brain; Cerebral Angiography; Cerebrovascular Circulation; Computer Simulation; Female; Fourier Analysis; Humans; Image Interpretation, Computer-Assisted; Image Processing, Computer-Assisted; Imaging, Three-Dimensional; Male; Middle Aged; Models, Theoretical; Phlebography; Radio Waves
PubMed: 28799210
DOI: 10.1002/mrm.26864 -
Magma (New York, N.Y.) Oct 2020Coronary magnetic resonance angiography (coronary MRA) is advantageous in its ability to assess coronary artery morphology and function without ionizing radiation or... (Review)
Review
Coronary magnetic resonance angiography (coronary MRA) is advantageous in its ability to assess coronary artery morphology and function without ionizing radiation or contrast media. However, technical limitations including reduced spatial resolution, long acquisition times, and low signal-to-noise ratios prevent it from clinical routine utilization. Nonetheless, each of these limitations can be specifically addressed by a combination of novel technologies including super-resolution imaging, compressed sensing, and deep-learning reconstruction. In this paper, we first review the current clinical use and motivations for non-contrast coronary MRA, discuss currently available coronary MRA techniques, and highlight current technical developments that hold unique potential to optimize coronary MRA image acquisition and post-processing. In the final section, we examine the various research-based coronary MRA methods and metrics that can be leveraged to assess coronary stenosis severity, physiological function, and atherosclerotic plaque characterization. We specifically discuss how such technologies may contribute to the clinical translation of coronary MRA into a robust modality for routine clinical use.
Topics: Contrast Media; Coronary Angiography; Coronary Vessels; Heart; Magnetic Resonance Angiography
PubMed: 32242282
DOI: 10.1007/s10334-020-00834-8 -
Journal of Vascular and Interventional... Dec 2019To characterize angiographic and cross-sectional imaging anatomy of the rat visceral vasculature in 2 translational models.
PURPOSE
To characterize angiographic and cross-sectional imaging anatomy of the rat visceral vasculature in 2 translational models.
MATERIALS AND METHODS
Animal studies were conducted in accordance with institutional guidelines and approval of the Institutional Animal Care and Use Committees. Retrospective review of digital subtraction arteriography was performed in 65 Wistar and 50 Sprague-Dawley male rats through a left common carotid artery or right common femoral artery approach. MR imaging of the abdomen was performed on the rats to correlate imaging modalities.
RESULTS
Aortography was performed in 3 locations, including cranial to the celiac artery, cranial to the renal arteries, and cranial to the caudal (inferior) mesenteric artery, enabling characterization of the visceral branch arteries in all 65 Wistar rats. Selective arteriography of first-, second-, and third-order branch vessels of the aorta was performed allowing characterization of normal and variant anatomy. Dedicated selective arteriography was performed of the celiac artery in 65 Wistar and 10 Sprague-Dawley rats, of the common hepatic artery in 65 Wistar and 50 Sprague-Dawley rats, and of the cranial mesenteric artery in 43 Wistar rats. MR imaging enabled correlation with the lobar and portal venous anatomy.
CONCLUSIONS
Analysis of arteriography and MR imaging in these rat models will provide translational researchers with anatomic details needed to develop new endovascular protocols for small animal research in interventional radiology.
Topics: Angiography, Digital Subtraction; Animals; Aorta; Aortography; Celiac Artery; Magnetic Resonance Angiography; Male; Models, Animal; Portal Vein; Predictive Value of Tests; Rats, Sprague-Dawley; Rats, Wistar; Retrospective Studies; Translational Research, Biomedical; Viscera
PubMed: 31202678
DOI: 10.1016/j.jvir.2019.03.005 -
Klinische Monatsblatter Fur... Sep 2017Optical coherence tomography angiography (OCTA) provides, non-invasively, a three-dimensional visualization of the microvasculature of the retina and choroid. However,... (Comparative Study)
Comparative Study Review
Optical coherence tomography angiography (OCTA) provides, non-invasively, a three-dimensional visualization of the microvasculature of the retina and choroid. However, image artifacts may occur in OCTA and have an impact on clinical interpretation. The aim of this article is to describe image artifacts of OCTA and to present a nomenclature. OCTA examinations were performed with the AngioPlex OCTA-technology in combination with the CIRRUS HD-OCT 5000 (Carl Zeiss Meditec, Inc., Dublin, USA) as well as with the PlexElite 9000 (Carl Zeiss Meditec, Inc., Dublin, USA). Typical artifacts identified in the OCTA images are described and their causes are explained. There are three main groups of artifacts that can be distinguished: (a) artifacts that are inherent in the OCTA technology and occur with all types of devices (projection artifacts, masking, unmasking, loss of signal); (b) artifacts caused by data and image processing algorithms and whose frequency or severity may depend on the device type used (segmentation artifacts, duplications of vessels); (c) motion artifacts that vary in frequency and severity depending on the type of device used, as different methods (e.g., eye tracker) are used to reduce them. The occurrence of artifacts is also dependent on patient cooperation, the clarity of the optical media, and the pathology of the retina. As in any other imaging method, artifacts also occur in OCTA images. Nevertheless, qualitative assessment of OCTA images is almost always possible and provides indispensable findings on the morphology and perfusion status of the retina and choroid. A good knowledge of possible artifacts, and a critical analysis of the complete OCTA data set, allows a correct interpretation and is essential for making a precise clinical diagnosis.
Topics: Angiography; Artifacts; Choroid Diseases; Diagnosis, Differential; Equipment Design; Humans; Retinal Diseases; Risk Factors; Tomography, Optical Coherence
PubMed: 28628928
DOI: 10.1055/s-0043-112857 -
Medical Physics Jun 2011In 1980 DSA provided a real time series of digitally processed angiographic images that facilitated and reduced the risk of angiographic procedures. This technique has... (Review)
Review
In 1980 DSA provided a real time series of digitally processed angiographic images that facilitated and reduced the risk of angiographic procedures. This technique has become an enabling technology for interventional radiology. Initially it was hoped that intravenous DSA could eliminate the need for arterial injections. However the 2D nature of the images resulted in overlap of vessels and repeat injections were often required. Ultimately the use of smaller arterial catheters and reduced iodine injections resulted in significant reduction in complications. During the next two decades time resolved MR DSA angiographic methods were developed that produced time series of 3D images. These 4D displays were initially limited by tradeoffs in temporal and spatial resolution when acquisitions obeying the Nyquist criteria were employed. Then substantial progress was made in the implementation of undersampled non-Cartesian acquisitions such as VIPR and constrained reconstruction methods such as HYPR, which removed this tradeoff and restored SNR usually lost by accelerated techniques. Recently, undersampled acquisition and constrained reconstruction have been applied to generate time series of 3D x-ray DSA volumes reconstructed using rotational C-arm acquisition completing a 30 year evolution from DSA to 4D DSA. These 4D DSA volumes provide a flexible series of roadmaps for interventional procedures and solve the problem of vessel overlap for intravenous angiography. Full time-dependent behavior can be visualized in three dimensions. When a biplane system is used, 4D fluoroscopy is also possible, enabling the interventionalist to track devices in vascular structures from any angle without moving the C-arm gantrys. Constrained reconstruction methods have proved useful in a broad range of medical imaging applications, where substantial acquisition accelerations and dose reductions have been reported.
Topics: Angiography; Fluoroscopy; Four-Dimensional Computed Tomography; Humans; Image Processing, Computer-Assisted; Time Factors
PubMed: 21815371
DOI: 10.1118/1.3589132 -
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 -
Sichuan Da Xue Xue Bao. Yi Xue Ban =... May 2021A 42-year-old male was admitted for paroxysmal syncope for 10 months, chest tightness for 20 days and chest pain for 10 days. The patient was diagnosed with... (Review)
Review
A 42-year-old male was admitted for paroxysmal syncope for 10 months, chest tightness for 20 days and chest pain for 10 days. The patient was diagnosed with hypertrophic cardiomyopathy. The patient did not have a history of hypertension or diabetes. Coronary angiography and left ventricular cardiac catheterization were done in order to examine the coronary artery and the pressure gradient of the left ventricular outflow tract. The cardiac catheterization was performed via a right radial artery approach and a total of 200 mL of 370 mg I/mL iopromide was injected. The patient developed contrast-induced encephalopathy following the cardiac catheterization procedure, displaying severe headache, cortical blindness and neuropsychiatric symptom as the main clinical manifestations. The patient was then given symptomatic and supportive treatment, including decreasing intracranial pressure, analgesics and sedatives, and the patient recovered.
Topics: Adult; Brain Diseases; Cardiomyopathy, Hypertrophic; Coronary Angiography; Humans; Iohexol; Male
PubMed: 34018376
DOI: 10.12182/20210560508