SEARCH · PubMed Health

Results for “Angiography”

Explore indexed PubMed citations for clinical trials, systematic reviews and public health research. Read source abstracts and follow each citation to its original PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 307 records · Page 17Linked to original sources

PubMed2006

MR angiography of the great anterior radiculomedullary artery (Adamkiewicz artery) validated by digital subtraction angiography.

BACKGROUND AND PURPOSE: Imaging of the anterior superficial spinal cord arteries by MR angiography is hindered by their small calibers and the similarity in configuration with the anterior superficial spinal cord veins. To validate the location and spatial configuration of the great anterior radiculomedullary artery, (ie, the Adamkiewicz artery [AKA]), contrast-enhanced MR angiography (CE-MRA) was compared with digital subtraction angiography (DSA). METHODS: Fifteen patients with suspected spinal cord vascular pathology underwent both spinal CE-MRA and selective spinal DSA. Two phase CE-MRA was performed with the use of a centric k-space filling scheme synchronized to the contrast bolus arrival. The level and side of the AKA origin were scored on the DSA and CE-MRA images and compared regarding image quality in terms of vessel conspicuity, contrast, continuity, sharpness, and background homogeneity on a relative 5-point scale. RESULTS: Localization and spatial configuration of the AKA by CE-MRA was in agreement with DSA findings in 14 of 15 cases. One mismatch of 1 vertebral level (not side) appeared as a result of the tangled vascular pathology. Comparison of image quality revealed that DSA is superior to CE-MRA concerning vessel continuity, sharpness, and background homogeneity (P < .001). Overall vessel conspicuity and contrast were judged to be similar. CONCLUSION: CE-MRA can visualize and localize the level of the AKA correctly. Image quality of CE-MRA is sufficient for detection of the AKA but is inferior to DSA.

Adult↗

PubMedDate not supplied

Comparison of intra-arterial digital subtraction angiography with conventional angiography after transcatheter arterial embolization for hepatic malignancy.

Twenty patients with hepatic malignancy were treated with transcatheter arterial embolization (TAE) under examination by intra-arterial digital subtraction angiography (IA-DSA) and conventional angiography (CA). Comparison of these two angiographies revealed that the time required for confirmation of the embolized portion of the artery was about four-and-a-half times shorter with IA-DSA than CA. Moreover, IA-DSA revealed the obstructed portion more readily and accurately than CA. In particular, confirmation could not be made by CA in 35% of cases because of residual Gelform sponge containing contrast medium in the artery. The visualization of residual tumor stain after TAE was 40% better on IA-DSA than CA, because of residual Gelform sponge containing contrast medium and overlapping shadow with calcified costal cartilage, excretory pyelography, and original tumor stain. However, CA was better than IA-DSA in visualizing accidental obstruction of nonobjective arteries such as the cystic artery because of the poor spatial resolution and misregistration artifacts of IA-DSA. CA was better than IA-DSA in visualizing surrounding nonembolized hepatic parenchyma because of the misregistration artifacts of IA-DSA. For effective TAE without severe complication, we concluded that TAE for HCC should be performed under a combination of IA-DSA and CA.

Adult↗

PubMed1986

The role of digital subtraction angiography in neuroradiology. An evaluation of intravenous and intra-arterial digital subtraction angiography.

A few years after the introduction of intravenous digital subtraction angiography (DSA) in clinical practice it became clear that, although the method had been developed as an alternative to arterial angiography, especially for the analysis of cerebral ischemia, its application was not as successful as the earlier reports had indicated. Based on the results of a study comparing intravenous DSA, intra-arterial DSA, and the Doppler examination, in 168 consecutive patients, a diagnostic algorithm for the management of these patients is proposed. A second and more important application of digital subtraction is its use with arterial angiography, especially with a high resolution system configuration.

Angiography, Digital Subtraction↗

PubMed1995

[Clinical application of magnetic resonance angiography for coronary arteries: correlation with conventional angiography and evaluation of imaging time].

Magnetic resonance angiography (MRA) of the coronary arteries is a particularly difficult task because of the small size of the vessels and cardio-respiratory motion. The authors describe a method of performing of ultrafast MRA of the coronary arteries with a standard MR system and body coil. Each image was obtained within a single breath hold by "segmented Turbo FLASH" sequences using an electrocardiography gate. Clinical application was performed in 20 patients with ischemic heart disease, and a comparison was made with conventional coronary angiography. The imaging time was shortened significantly by our methods. The diagnosis was made by at least two different images to avoid false positives. The results indicated a good correlation between MRA and conventional angiography.

Aged↗

PubMed1993

Comparison of accuracy of magnetic resonance angiography with conventional angiography: a report of 45 cases.

To investigate the accuracy of magnetic resonance angiography (MRA), compared to conventional cerebral and carotid angiography (CA), 45 patients underwent MRA within one week after CA. The MRA involves a FISP (fast imaging steady precession) pulse sequence base on three-dimensional time-of-flight phenomena at 1.0 Tesla. Repetition time of 35-40 msec, echo time of 7-11 msec and a flip angle of 15-25 degrees were used to optimise the depiction of blood flow as high intensity. Volume data were then submitted to a maximum intensity projection programme and viewed at multiple arbitrary projection angles rotating through the three orthogonal planes. Venous structures were suppressed with a presaturation slab superior to the area of interest. All significant stenoses and occlusions at the carotid bifurcation and circle of Willis were detected. Other than the carotid siphon (61.4%), the rest of the arteries have above 70% complete agreement between MRA and CA. The carotid bifurcation and basilar artery show complete agreement of 75.4% and 76.2% respectively, making MRA a simple sensitive screening procedure. This report shows that MR angiography has an important role in the evaluation of blood flow in the head and neck regions.

Adolescent↗

PubMed1996

Anatomic evaluation of the circle of Willis: MR angiography versus intraarterial digital subtraction angiography.

PURPOSE: To evaluate the reliability of source images and maximum intensity projection images of MR angiography in showing the arterial segments of the circle of Willis. METHODS: In 62 patients, 526 arterial segments of the circle of Willis were determined to be present, partially present, or absent by blinded observers evaluating MR angiographic source images and maximum intensity projection images. Vessel diameter was measured on source images. These results were then compared with the results from intraarterial digital subtraction angiography. RESULTS: MR angiographic maximum intensity projection images had a sensitivity of 87% and a specificity of 88% and MR angiographic source images had a sensitivity of 89% and a specificity of 63% in depicting the presence of a vessel segment. The positive predictive value of an arterial segment with a diameter of at least 1 mm was 99%. CONCLUSION: MR angiography is a sensitive technique for detecting the anatomy of the circle of Willis. Maximum intensity projection images are more specific than source images. An arterial segment with a diameter of at least 1 mm on the source image is almost always present and patent.

Adolescent↗

PubMed1997

[A comparison of ultrafast computed tomography, magnetic resonance angiography and selective angiography for the detection of coronary bypass patency].

PURPOSE: Validation of ultrafast-CT and MR-angiography (MRA) in comparison with angiography for detection of early postsurgical arterial and venous coronary artery bypass graft (CABG) patency. METHODS: 21 patients with a total of 55 CABG (34 venous and 21 arterial) were studied with angiography, ultrafast-CT (EBT), and MRA. RESULTS: With EBT, patency of 43/45 angiographically patent CABG could be correctly assessed (sensitivity: 96%). With MRA 26 CABG (17 venous and 9 arterial) were identified as patent (sensitivity: 67%). It was not possible to quantify proximal stenosis of three grafts (> 40%) and to evaluate the distal bypass anastomosis with both EBT and MRA. CONCLUSIONS: Ultrafast-CT is a promising minimal invasive screening method for the evaluation of venous and arterial CABG patency. The diagnostic significance of MRA is remarkably reduced.

Aged↗

PubMed1983

Fluorescein angiography of the heavily pigmented iris and new dyes for iris angiography.

An inexpensive adapter mounted in front of the objective lens of a fundus camera permits routine fluorescein angiography of the heavily pigmented iris. Angiograms of these patients whose iris pigment was dense enough that standard methods of iris angiography would disclose little or no information were performed with the use of the adapter. For use in the study of the iris vasculature in the research laboratory, three dyes with spectral characteristics different from those of fluorescein allow angiography of the iris at different wavelengths. Angiograms using these dyes were performed on the eye of a cynomolgus monkey. The angiograms were each taken as close as possible to the same time sequence and show dramatically different filling and staining patterns.

Animals↗

PubMed1984

Duplex ultrasonography, digital subtraction angiography, and conventional angiography in assessing carotid atherosclerosis.

We prospectively compared duplex ultrasonography with digital subtraction angiography (DSA) and conventional angiography in the evaluation of carotid atherosclerosis by studying 494 arteries. Arteries were graded independently as normal, mildly stenotic, moderately stenotic, severely stenotic, or occluded. There was absolute agreement between duplex ultrasonography and DSA as to disease severity in 296 (68%) of 434 vessels, good correlation in an additional 119 vessels (28%), and poor correlation in 19 vessels (4%). When duplex studies were compared with conventional angiograms, the correlations were similar: absolute for 60 (71%) of 85 vessels, good for 17 (20%) of 85 vessels, and poor for eight (9%) of 85 vessels. With conventional angiography as the standard, duplex studies tended to overestimate the severity of disease in 64% of vessels and underestimate it in 36%, v 28% and 72%, respectively, for DSA. We concluded that duplex ultrasonography is as accurate as DSA in assessing carotid bifurcation atherosclerosis. The tendency of DSA to underestimate disease severity may lead to diagnostic errors in patients with nonobstructive plaques.

Carotid Artery Diseases↗

PubMed1994

CT angiography of the common carotid artery bifurcation: comparison between two techniques and conventional angiography.

We prospectively compared CT angiography (CTA) of the common carotid artery bifurcation using two different techniques with conventional angiography in patients with suspected stenoses of the internal carotid arteries in 20 symptomatic patients. Ten patients (Group 1) received 60 cc of contrast (medium 2 cc/sec) and CTA was acquired using 5 mm slices, reconstructed at 3 mm slice thickness. Ten patients (Group 2) received 90 cc of contrast (medium 3 cc/sec) and CTA was acquired using 3 mm slices reconstructed at 1 mm slice thickness. All CTA studies were postprocessed using maximum intensity projection algorithm. Stenoses were graded prospectively from CT angiograms and compared with selective conventional catheter angiograms. In Group 1, CTA overestimated the degree of narrowing in 9 of 10 stenoses proven by conventional angiograms. We interpreted 2 nearly occluded internal carotid arteries, 2 with moderate and marked stenoses, and 2 with no narrowings, but fibromuscular dysplasia on conventional angiograms as occluded on CTA, and 3 vessels as showing marked stenoses, not confirmed by angiography. CTA clearly depicted 1 mild stenosis, 4 normal bifurcations, and 6 occluded internal carotid arteries. In Group 2, CTA overestimated two stenoses; a correct diagnosis was made in 7 normal bifurcations, 3 mild, 2 moderate and 2 severe stenoses, 2 near occlusions, and 2 occlusions. Ulcerations were missed by CTA regardless of the technique utilized.

Adult↗

PubMedDate not supplied

Multislice CT angiography in renal artery stent evaluation: prospective comparison with intra-arterial digital subtraction angiography.

PURPOSE: To assess the role of multislice computed tomography angiography (MCTA) in the evaluation of renal artery stents, using intra-arterial digital subtraction angiography (DSA) as the gold standard. METHODS: Twenty consecutive patients (15 men, 5 women) with 23 renal artery stents prospectively underwent both MCTA and DSA. Axial images, multiplanar reconstructions and maximum intensity projection images were used for diagnosis. The MCTA and DSA images were each interpreted without reference to the result of the other investigation. RESULTS: The three cases of restenosis on DSA were detected correctly by MCTA; in 19 cases where MCTA showed a fully patent stent, the DSA was also negative. Sensitivity and negative predictive value (NPV) of MCTA were therefore 100%. In four cases, MCTA showed apparently minimal disease which was not shown on DSA. These cases are taken as false positive giving a specificity of 80% and a positive predictive value of 43%. CONCLUSION: The high sensitivity and NPV suggest MCTA may be useful as a noninvasive screen for renal artery stent restenosis. MCTA detected mild disease in a few patients which was not confirmed on angiography.

Adult↗

PubMed2002

MR angiography vs CT angiography in the follow-up of nitinol stent grafts in endoluminally treated aortic aneurysms.

Our objective was to evaluate the accuracy of contrast-enhanced 3D MR angiography (MRA) in the follow-up of patients with endoluminally treated aortic aneurysms and correlate these findings with uni- or biphasic CT angiography (CTA). Forty MR angiograms in 32 patients with implanted aortic nitinol stent grafts were compared to CTA. Twenty-two MR examinations were correlated with arterial-phase CTA (uniphasic), and 18 MR examinations were correlated with biphasic CTA. Uniphasic CTA demonstrated three type-1/type-3 endoleaks and four reperfusion (type-2) endoleaks. In addition, MRA depicted two type-2 reperfusion endoleaks that were missed by CTA. Using biphasic CTA, two type-1/type-3 endoleaks and three reperfusion (type-2) endoleaks were detected; of those, delayed scanning detected three reperfusion (type-2) endoleaks missed during arterial-phase CTA. In addition to the findings by CTA, MRA depicted another type-2 reperfusion endoleak. Magnetic resonance angiography is at least as sensitive as uni- or biphasic CTA for detecting endoleaks and may consequently offer advantages in patients with contraindications to iodinated contrast agents.

Aged↗

PubMed2006

Visual and automatic grading of coronary artery stenoses with 64-slice CT angiography in reference to invasive angiography.

The aim of this study was to assess the performance of a software tool for quantitative coronary artery analysis of computed tomography coronary angiography (CT-QCA) in comparison with invasive coronary angiography with quantitative analysis (CAG-QCA) as standard of reference. Two radiologists reviewed the CT angiography data sets (Siemens Sensation 64) of 25 patients, grading coronary artery stenoses visually and with a software tool (Circulation, Siemens). Twenty-three data sets with sufficient image quality were included in the final analysis. CAG revealed a total of 30 wall irregularities and 28 stenoses, of which 17 were graded as moderate and nine as hemodynamically significant. CT-QCA showed a better agreement to CAG-QCA, with a systematic overestimation of the degree of stenosis of 6.1% and limits of agreement of +36.1% and -23.9; the correlation coefficient was 0.82 (p < 0.0001). Using CT-QCA, sensitivity, specificity, and positive and negative predictive value were 89%, 100%, 89%, and 100%, respectively, for significant area stenoses greater than 75%. The positive predictive value for the visual assessment amounted to 53%. Interobserver variability between CT-QCA and visual assessment showed a kappa value of 0.72. In conclusion, software-supported CT-QCA makes it possible to quantify significant coronary artery stenoses automatically, with good agreement to CAG-QCA.

Contrast Media↗

PubMed1993

Emergent aneurysmal surgery without preoperative angiography: usefulness of the intraoperative portable digital subtraction angiography.

A 42-year-old male with subarachnoid and large intracerebral hemorrhage in coma was operated without preoperative angiography because of impending cerebral herniation. After emergent decompressive craniotomy, intraoperative digital subtraction angiography (DSA) was performed and a middle cerebral artery aneurysm was demonstrated clearly. Aneurysmal neck clipping was successfully performed, and the patient made a good recovery and returned to almost independent activity with minimal hemiparesis. The prognosis of patients with ruptured aneurysm with large intracerebral hematoma is affected by early hematoma evacuation. Since the time spent for preoperative angiography may cause irreversible damage to the brain stem, in such case, early decompressive procedure and subsequent aneurysm diagnosis by intraoperative DSA may be used as alternative method to achieve a good outcome.

Adult↗

PubMed1998

Angiography after aneurysm surgery: indications for "selective" angiography.

BACKGROUND: The need for postoperative cerebral angiography to confirm clip placement is largely a matter of the individual surgeon's preference, but in an atmosphere of limited health care resources and rising costs this attitude may need to be changed. METHODS: A series of 312 intracerebral aneurysms harbored in 227 consecutive patients were clipped by a single surgeon (WF) and studied with postoperative selective angiography. Clues were sought to identify which (if any) aneurysms were prone to require postoperative recognition of incomplete or inaccurate clipping. We examined aneurysmal size, patient's sex, age, preoperative Hunt/Hess Grade, and Fisher CT grade, to determine their relationship to poor surgical clipping results (residual aneurysm or major vessel occlusion). RESULTS: There were 13 cases of residual aneurysm (4.2%) and one case of major vessel occlusion (0.3%). Deep midline aneurysms (posterior circulation, anterior communicating artery) and ophthalmic (paraophthalmic) artery regions formed a group of patients with an increased risk of imperfect clip placement (8.2%; 13/157) as compared to patients with aneurysms in other locations (0.6%; 1/155) (p < 0.05). In addition, incompletely obliterated aneurysms proved to have a high rehemorrhage rate in this series. CONCLUSIONS: A retrospective analysis revealed that deep midline aneurysms are more prone to inadequate clipping, and therefore, as a bare minimum represent aneurysms requiring confirmatory postoperative evaluation. This contemporary series can be used as a basis to compare the results from intraoperative angiography.

Adult↗

PubMed2005

CT angiography is here--are we expected to see a change of angiography referral pattern?

A 52-year-old asymptomatic man, with cardiac risk factors of hypertension, Type II diabetes, hypertriglyceridemia, low HDL, obesity, and positive family history for early coronary artery disease (CAD), was referred to nuclear stress test. He exercised for 14 minutes, achieved his target heart rate, without any symptoms or ECG changes. Nuclear images were entirely normal. However, the patient was still concerned and anxious so he underwent CT angiography that revealed coronary narrowings. Next, he underwent coronary angiography with similar findings. The lesions were treated with stents. We present a case report to illustrate how newer technology such as CT angiography alters the way in which we diagnose CAD and decide on whether to pursue further invasive therapy.

Angioplasty, Balloon, Coronary↗

PubMed2003

Comparison of intravenous coronary angiography using synchrotron radiation with selective coronary angiography.

Intravenous coronary angiography with synchrotron radiation is a novel and minimally invasive technique for coronary imaging. At the Hamburger Synchrotronstrahlungslabor HASYLAB at DESY, a dedicated angiography system has been developed, which has been shown to provide detailed images of coronary artery segments. For each scan, two monochromatic X-ray images below and above the K-edge of iodine were recorded simultaneously. The two images were subtracted logarithmically to produce a maximal contrast enhancement of the iodine. To date, the procedure has been carried out on 379 outpatients. No complications occurred during or after the angiographic procedure, and hospitalization was not required in any subject. The acceptance by patient is extremely high. Five outside reviewers, blinded as to the clinical data or prior angiographic interpretation, reviewed the images for the presence or absence of 70% or more occlusion of a vessel. They reached a sensitivity of 79% and a specificity of 99%. The study has demonstrated that the synchrotron method has satisfactory sensitivity and very high specificity for severe stenoses. The new method has several advantages over magnetic resonance imaging (MRI), electron beam computed tomography (EBCT), and multi-slice computed tomography (MSCT). Neither vascular calcification (CT) nor the presence of metal stents (MRI) impairs the evaluation of perfusion of segments of the coronary arteries. Furthermore, the spatial resolution is three or four times higher using synchrotron angiography, and problems due to respiratory motion are eliminated.

Adult↗

PubMed1995

Two-dimensional time-of-flight magnetic resonance angiography in the coronal plane for abdominal disease: its usefulness and comparison with conventional angiography.

Using two-dimensional time-of-flight magnetic resonance angiography (2D-TOF MRA) in the coronal plane, 54 cases of arterial disease and 46 cases of venous disease were evaluated. The results were compared with those of conventional angiography to establish their relative usefulness for diagnosing abdominal diseases. Using 2D-TOF MRA, relatively large vessels such as the splenic artery, the trunks of the superior mesenteric artery (SMA) and the renal artery were clearly visualized. However, smaller vessels such as the gastroduodenal artery, main hepatic artery, branches of the SMA and the renal artery were not clearly imaged. The diameters of stenotic arteries correlated well with their images on conventional angiography (r = 0.953). In the venous system, the splenic, renal and portal veins and the first branches of the portal vein bilaterally were clearly imaged. Veins, normal or abnormal, less that 5 mm in diameter were not clearly imaged using 2D-TOF MRA. 2D-TOF MRA in the coronal plane provided useful diagnostic information, especially regarding venous diseases, tumour thrombi in the portal vein, renal vein or inferior vena cava (IVC), collateral vessels or shunts, vascular malformations, and the relationships between the portal and hepatic veins. Limitations encountered in arterial disease did not interfere with evaluations of venous disease.

Abdomen↗