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At least 487 records · Page 27Linked to original sources
PubMed2006

Comparative evaluation of oral fluorescein angiography using the confocal scanning laser ophthalmoscope and digital fundus camera with intravenous fluorescein angiography using the digital fundus camera.

BACKGROUND: To study the efficacy of oral fluorescein angiography (FA) with confocal scanning laser ophthalmoscope (CSLO). METHODS: Ten patients each of choroidal neovascular membrane, central serous retinopathy, diabetic retinopathy and five normal subjects were evaluated with group 1 - intravenous FA using digital fundus camera (DFC); group 2 - oral FA using DFC; and group 3 - oral FA using CSLO. RESULTS: Third-order branch vessels were identified in 85.7% eyes in group 3 versus 51.4% in group 2 (P = 0.004), image quality was comparable to intravenous FA in 77.1% in group 3 versus 48.5% in group 2 (P = 0.02) and margin delineation was better in 80% eyes in group 3 versus 35% in group 2 (P = 0.01). The foveal avascular zone was clear and intact in 54.2% eyes in group 3 versus 37.1% in group 2 (P = 0.14) and 57.1% in group 1 (P = 0.8). CONCLUSION: Oral FA using CSLO is superior to oral FA using DFC and comparable to intravenous FA using DFC in terms of image quality, branch retinal vessel identification and margin delineation.

Administration, Oral↗
PubMed2001

Aorta and runoff vessels: single-injection MR angiography with automated table movement compared with multiinjection time-resolved MR angiography--initial results.

The authors compared two techniques for performing runoff, contrast material-enhanced magnetic resonance (MR) angiography. Multiinjection time-resolved imaging of contrast kinetics (TRICKS) and single-injection bolus-chase MR angiographic examinations were performed in 10 volunteers and 10 patients. Image quality and venous overlay of the major blood vessels of the abdomen, thigh, and calf were evaluated. Significantly more (P <.05) vessels were depicted with diagnostic quality on multiinjection TRICKS than on single-injection bolus-chase MR angiographic images.

Adult↗
PubMed1999

Renal insufficiency: usefulness of gadodiamide-enhanced renal angiography to supplement CO2-enhanced renal angiography for diagnosis and percutaneous treatment.

PURPOSE: To determine whether gadodiamide is a safe and useful angiographic contrast agent for help in diagnosis and percutaneous treatment of renal artery stenosis in patients with renal insufficiency. MATERIALS AND METHODS: Diagnostic renal angiography and percutaneous renal interventions were performed by using gadodiamide (total dose, 0.3 mmol/kg) and CO2 as intraarterial contrast agents in 25 procedures in 24 patients with renal insufficiency. Serum creatinine levels were obtained within 24 hours before and at 24 and 48 hours after the procedure. Increases in serum creatinine of more than 44 mumol/L were considered clinically important. Gadodiamide-enhanced angiograms were compared with CO2-enhanced angiograms. RESULTS: In 23 (92%) of 25 procedures, there was no increase in serum creatinine level at 48 hours. One patient with acute and chronic rejection of a renal transplant and one with evidence of cholesterol embolization had a clinically important increase in serum creatinine level at 48 hours. No marked increase in creatinine level was observed in patients with relatively low baseline levels (n = 19). Gadodiamide-enhanced angiograms appeared to be better than CO2-enhanced angiograms for help in identifying renal artery occlusions, visualizing renal vessels incompletely filled with CO2, and determining the progress of intervention. CONCLUSION: Gadodiamide appears to be a safe and useful intraarterial contrast agent in patients with renal insufficiency and can be used to supplement or confirm CO2-enhanced angiographic findings.

Acute Disease↗
PubMed2000

Partial fat-saturated contrast-enhanced three-dimensional MR angiography compared with non-fat-saturated and conventional fat-saturated MR angiography.

Abdominal three-dimensional magnetic resonance angiography was performed in 35 patients in the equilibrium phase without fat saturation, with conventional fat saturation, and with fast partial fat saturation. Qualitative and quantitative evaluation demonstrated significantly better vessel visualization with both fat-saturated techniques. The partial fat-saturated technique provided water-specific images within a breath hold, reducing motion artifacts significantly.

Abdomen↗
PubMed2006

Surgical and endovascular repair of aortic coarctation: normal findings and appearance of complications on CT angiography and MR angiography.

OBJECTIVE: A variety of treatment options exist for aortic coarctation, both surgical and catheter-based. Knowledge of the normal radiologic appearance of these, as well as their typical complications, is essential for interpretation of CT and MR angiographic studies in these patients. CONCLUSION: CT and MR angiography are noninvasive techniques that are well suited to follow patients after coarctation repair.

Adult↗
PubMed2005

Three-dimensional digital subtraction angiography vs two-dimensional digital subtraction angiography for detection of ruptured intracranial aneurysms: a study of 86 aneurysms.

AIMS: Three-dimensional reconstruction of intracranial vessels is of interest for evaluation of aneurysms. This study determined diagnostic difference of three-dimensional digital subtraction angiography (3D-DSA, volume-rendering image) versus 2D-DSA for evaluating ruptured intracranial aneurysms, particularly focusing on the size of aneurysms as depicted in both images. SETTINGS AND DESIGN: Sixty-nine patients underwent 3D-DSA and 2D-DSA. The relative size of an aneurysm, which is the ratio of the maximal diameter of an aneurysm to the diameter of a major vessel, was compared between imaging techniques. In addition, relative sizes of smaller aneurysms (< 5 mm) were compared with those of larger aneurysms (>10 mm). STATISTICAL ANALYSIS USED: For comparison of aneurysm size and location of aneurysm, statistical analysis was performed with the Yates chi square test; statistical significance was set with a P value of less than 0.05. RESULTS: Sixty-three (73.3%) of the 86 total aneurysms were bigger when measured with 3D-DSA versus 2D-DSA. When measured with 3D-DSA, 28 (84.8%) of the 33 smaller aneurysms were bigger, and 50% of the larger aneurysms were bigger versus measurements of 2D-DSA images (P < 0.05). In ACA and ICA territories, which tended to have smaller mean aneurysmal size, relative size of the aneurysm was bigger when measured with 3D-DSA (81.5% and 81.0%, respectively). In MCA, where the mean aneurysmal size was the largest, relative size of aneurysms was bigger when measured with 3D-DSA in 15 cases (53.6%, P < 0.05). In the posterior circulation, aneurysm size was similar between 3D-DSA and 2D-DSA measurements. CONCLUSIONS: 3D-DSA, especially volume-rendering images, tends to depict ruptured intracranial aneurysms bigger than 2D-DSA. This is particularly true with cerebral aneurysms that are < 5 mm in size and are located in the anterior circulation, especially ICA and ACA territories.

Aneurysm, Ruptured↗
PubMedDate not supplied

Aortoiliac stenooculusive disease and aneurysms: screening with non-contrast enhanced two-dimensional cardiac gated cine phase contrast MR angiography with multiple velocity encoded values and cardiac gated two-dimensional time-of-flight MR angiography.

PURPOSE: To evaluate the performance of two-dimensional cine phase contrast MRA with multi-velocity encoded values (multi-VENC cine PC) and ECG-gated two-dimensional time-of-flight MRA (ECG-2D-TOF) for the detection of stenoocclusive lesions and aneurysms in the aortoiliac area, when each method was used individually and when the two methods were used together. METHODS: Forty-one patients were included in this study. Multi-VENC cine PC and ECG-2D-TOF were obtained first, then contrast enhanced three-dimensional magnetic resonance angiography (CE-3D-MRA) was performed as the standard of reference. Two observers reviewed the images separately without knowledge of patients' symptoms or histories. Sensitivities and specificities were obtained separately for stenooclusive lesions and aneurysms by two reviewers. RESULTS: When the two methods were applied together, high sensitivities (93.0 by observer 1 and 91.9% by observer 2) and adequate specificities (87.6 and 82.3%) were obtained for stenoocclusive lesions. For aneurysms, moderate to high sensitivities (91.1 and 71.1%) and high specificities (98.8 and 99.4%) were obtained. CONCLUSION: These results suggest that the performance of two non-contrast enhanced MRA techniques may be valuable as a screening tool when the two methods are applied together.

Aged↗
PubMed1976

Indocyanine green dye fluorescence and infrared absorption choroidal angiography performed simultaneously with fluorescein angiography.

The sensory retina of the eye is nourished by two essentially separate blood circulations. The more superficial of these, the retinal circulation, is easily evaluated by direct visualization or routine fluorescein angiography. However, the underlying choroidal circulation, which is attributed with maintenance of the outer layers of the retina is not easily visualized due to the pigment epithelial layer and choroidal pigment. Fluorescence and infrared absorption angiographic techniques using indocyanine green (ICG) dye, which can be used to evaluate the choroidal circulation routinely, are described in this paper. A method is also described which can provide these angiograms simultaneously with standard fluorescein fluorescence angiograms of the retina. Finally, a comparison of all three types of angiograms is made. Limitations to the resolution of fundus details in angiograms imposed by optics of the fundus camera, photographic films, and optics and anatomy of the eye are examined.

Absorption↗
PubMedDate not supplied

Basics of non-invasive angiography contrast-enhanced magnetic resonance angiography.

Contrast-enhanced magnetic resonance angiography is a non-invasive imaging modality without catheterization or nephrotoxicity. This is accomplished by using paramagnetic contrast agents in combination with very rapid acquisition sequences. Paramagnetic contrast agent is injected intravenously and image data are collected during the first-pass of contrast agent through the vascular territory of interest. Due to the strong enhancement effect of paramagnetic contrast agents, a small dose injected as an intravenous bolus is sufficient to briefly enhance the entire arterial vascular tree. This allows imaging with a large field-of view that encompasses an extensive region of vascular anatomy. By using a dedicated 3D imaging sequence on scanners with high-performance gradient systems, high-resolution 3D volumes of image data can be acquired in a single breath-hold. This has vastly improved image quality of 3D contrast-enhanced MRA (CE-MRA) exams, particularly in the chest and abdomen. Subsequent postprocessing allows an angiographic display of image data in any desired obliquity. The following part gives an overview and the basic principles of the methods used for CE-MRA.

Contrast Media↗
PubMed2005

[Combined bolus magnetic resonance angiography and two-dimensional time-of-flight magnetic resonance angiography in patients with occlusive diseases of lower limb arteries].

AIM: The purpose of the work was to assess the diagnostic significance of combined bolus magnetic resonance angiography (MRA) and two-dimensional time-of-flight MRA of lower limb arteries as compared to radioangiography in patients with occlusive diseases of lower limb arteries. MATERIAL AND METHODS: Twenty-six patients with the symptoms of lower limb ischemia of varying severity were provided bolus MRA with prolonged manual injection of contrast substance and transposition of the MR-tomograph table. Additionally, all the patients underwent two-dimensional time-of-flight (2D TOF) MRA of the leg arteries. RESULTS: The statistic processing of bolus MSA for visualization of the pelvic segment has demonstrated its high sensitivity and specificity (97.74% and 92.31% respectively). On visualization of the femoral artery segment the sensitivity of this modality accounted for 97.57%, the specificity for 94.57%. In patients with severe ischemia, visualization of the leg arteries was difficult. Consequently, the specificity of the modality accounted for 44.58%. However, when this technique was combined with two-dimensional time-of-flight MRA of the leg arteries, the sensitivity and specificity of the modality reached 96.38% and 91.92% respectively. CONCLUSION: Bolus MRA of lower limb arteries is marked by the high sensitivity and specificity for visualization of the arteries of the iliac and femoral segments. To visualize the leg arteries in patients with severe forms of lower limb ischemia, this modality should be supplemented by two-dimensional time-of-flight MRA.

Aged↗
PubMedDate not supplied

Contrast-enhanced MR angiography at 3T in the evaluation of intracranial aneurysms: a comparison with time-of-flight MR angiography.

The combination of 3T and parallel-acquisition techniques holds promise for improved performance of contrast-enhanced MR angiography (MRA), in terms of speed, spatial resolution, and coverage. We present a comparison of 2 MRA techniques, including time-of-flight (TOF) and contrast-enhanced MRA, for detection and evaluation of intracranial aneurysms. Our results show that contrast-enhanced MRA with highly accelerated parallel acquisition at 3T does not have the known drawbacks of TOF-MRA techniques, including prolonged acquisition time, spin saturation, and flow-related artifacts, with comparable aneurysm characterization.

Aged↗
PubMed1988

Fibromuscular dysplasia of renal arteries: comparison of intravenous digital subtraction angiography with conventional angiography.

Intravenous digital subtraction angiography (IV-DSA) was compared with conventional arteriography (CA) in 14 patients with fibromuscular dysplasia (FMD) of at least one renal artery. IV-DSA identified 29 of the 34 renal arteries detected by CA. A diagnostic quality IV-DSA examination was obtained in 23 of 29 renal arteries (78%). In adequately imaged renal arteries, IV-DSA correctly identified 12 of 20 FMD renal arteries, misdiagnosed 8 FMD renal arteries as normal and correctly identified 3 normal renal arteries. These poor results, due to poor spatial resolution and subtraction artifacts inherent in the IV-DSA system, warrant careful interpretation of negative examinations and further evaluation of high risk patients.

Angiography↗
PubMed1985

[Conventional angiography and digital subtraction angiography in arterial occlusive disease of the extracranial branches of cerebral arteries].

In this paper the advantages and disadvantages of different arteriographic methods, i.e. conventional angiography, intraarterial DSA and intravenous DSA, are discussed for the purpose of examining the extracranial supraaortic branches. The analysis of individual vascular regions in arteriography of the aortic arch is assessed. In addiction, the value of i.v. DSA is demonstrated, comparing own results with data in the literature. Indications of the three different angiographic techniques are outlined.

Angiography↗
PubMed1980

[Complications following cerebral angiography. Report on 4181 cerebral angiographies].

Complications of 4181 cerebral angiographies performed from 1973 to 1978 in 2365 patients were analysed. In 13,6% of the patients temporary complications could be observed. In 3,1% temporary neurologic-psychiatric complications occurred, most of them in patients of younger age and in the presence of diffuse cerebrovasuclar disease. There was a permanent damage in 0,21%.

Adolescent↗
PubMed1994

Three-dimensional black blood MR angiography of the liver during breath holding. A comparison with two-dimensional time-of-flight MR angiography.

In 2-D time-of-flight MR angiography (2-D TOF MRA) of the liver, artifacts caused by respiratory motion are unavoidable. Therefore, a 3-D black blood MRA of the liver was attempted in 7 healthy volunteers, using a 3-D gradient echo sequence which allows imaging during breath holding. 2-D TOF MRA was performed as well. In all subjects, 3-D MRA allowed visualization of the trunk, 1st-, and 2nd-order branches of the portal vein without interruption. Right 3rd-order branches were visualized without interruption in 6 of 7 subjects (85%). However, with 2-D MRA, the transverse portion of the left main portal vein could not be visualized in any subject, and the periphery of the portal vein was less clear than with 3-D MRA.

Adult↗