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At least 451 records · Page 25Linked to original sources
PubMed1983

Digital subtraction cerebral angiography by intraarterial injection: comparison with conventional angiography.

For 4 months, a prototype digital subtraction system was used to obtain images of the cerebral vasculature after intraarterial contrast injections. In 12 instances, the intraarterial injections were recorded with both a digital subtraction unit and conventional direct magnification film-screen system. The digital subtraction and conventional film subtraction images were compared and graded for quality and information content by three skilled observers. In addition, quantitative measurements of contrast-detail performance and spatial resolution were obtained on both the digital system and the screen-film imaging chain. In a clinical setting, both the digital subtraction and conventional film-screen systems provided similar quality images and angiographic information. Contrast-detail curves demonstrated that digital subtraction angiography outperformed conventional film technique for low-contrast objects. Digital subtraction angiography also reduced the time required to obtain the angiogram, markedly reduced film cost, and lowered the contrast agent burden.

Adolescent↗
PubMed2002

[Evaluation of three-dimensional enhanced brain surface imaging using CT (3D surface CT angiography) and magnetic resonance imaging (3D surface MR angiography)].

The optimal imaging conditions for 3D brain surface imaging by magnetic resonance imaging (MRI) and multi-slice CT were investigated. Visualization of the sulci, gyri, and veins on the brain's surface was also compared between 3D surface images acquired using multi-slice CT and conventional single-slice CT and MRI. Various imaging parameters, including slice thickness, dose, and matrix size, were evaluated using our original brain surface phantom and longitudinal direction evaluation phantom as well as images obtained from healthy volunteers. Subjects of the clinical study were patients with arteriovenous malformations and brain tumors who underwent CT-angiography at the same time as MR-angiography. The quality of 3D images of the brain surface is most strongly influenced by partial volume effects related to slice thickness. In multi-slice CT, a slice thickness of 0.5 mm can be employed to minimize the partial volume effect, providing results that are far superior to those that can be achieved by conventional single-slice 3D-CT. In addition, the excellent S/N of multi-slice CT permits the veins on the brain's surface to be clearly visualized without the use of contrast medium. With regard to visualization of the sulci and gyri, although some problems remain to be overcome, multi-slice CT was found to be equivalent to 3D surface imaging using MRI.

Brain↗
PubMed1985

Duplex carotid sonography: correlation with digital subtraction angiography and conventional angiography.

Duplex sonography is a relatively new technique for noninvasive evaluation of the extracranial carotid arteries. In a prospective, double-blind study of 453 vessels (229 patients) over a one-year period, an excellent correlation was found with intravenous digital subtraction angiography (DSA) in 66.3 per cent of vessels, good correlation in an additional 28.4 per cent of vessels, and poor correlation in only 5.3 per cent. Duplex was compared with conventional biplane angiography in 86 vessels (45 patients); there was excellent correlation in 71 per cent, good correlation in 20 per cent, and poor agreement in 9 per cent of vessels. Duplex sonography is a highly accurate method of evaluating the cervical carotid system and it has a complementary role with DSA.

Aged↗
PubMed1999

Detection and assessment of circle of Willis aneurysms in acute subarachnoid hemorrhage with three-dimensional computed tomographic angiography: correlation with digital substraction angiography findings.

In this retrospective study, we examined the usefulness of computed tomographic angiography (CTA) for the detection and assessment of circle of Willis aneurysms in patients with acute nontraumatic subarachnoid hemorrhage (SAH), using selective digital substraction angiography (DSA) as the gold standard. Thirty-five patients who presented with acute, nontraumatic SAH, diagnosed on the basis of unenhanced computed tomography or lumbar puncture findings or both, underwent both CTA and DSA. The CTA images were interpreted for the presence, location, size, and shape of the aneurysm, presence of a neck, and relationship of the aneurysm to adjacent arterial branches. The CTA and DSA images were then compared, with the latter images serving as the gold standard. DSA revealed 37 aneurysms in 32 patients and ruled out intracranial aneurysms in the remaining three. The sensitivity and specificity of CTA for aneurysm detection were 97% and 100%, respectively. The size of the smallest aneurysm shown was 4 mm, and the largest aneurysm was 21 mm. The size and lobularity of the aneurysms estimated from CTA images corresponded well with those estimated from DSA images. In addition, CTA provided a three-dimensional representation of the aneurysmal lesion, which was considered useful for surgical planning. Our results confirm the accuracy of CTA in comparison with DSA. Because of its reliability, minimal invasiveness, and rapidity, CTA may become the technique of choice for neuroradiologic work-up of SAH patients. DSA then would be used to diagnose intracranial aneurysms only in selected, questionable cases.

Acute Disease↗
PubMed1998

[The fluorescein angiography and indocyanine green angiography of high myopia with macular hemorrhage].

OBJECTIVE: To investigate the causes and fundus changes of high myopia with macular hemorrhage. METHODS: Color photography and fundus fluorescein angiography (FFA) were performed on 35 patients (37 eyes) of high myopia with macular hemorrhages, and indocyanine green angiography (ICGA) was performed on 8 patients. RESULTS: The causes of high myopia with macular hemorrhage could be divided into two forms: (1) macular hemorrhage with subretinal neovascularization (23 eyes), (2) macular hemorrhage without subretinal neovascularization (14 eyes). ICGA noted the neovascularization more well-defined and slightly bigger than FFA. In 9 of 14 eyes, lacquer cracks appeared at the sites of macular hemorrhage or around the hemorrhage. 6 eyes were followed up, the follow-up period ranging from 3 to 20 months (mean, 8.6 months). ICGA was performed on two patients. The results show that the rupture of choriocapillaries and Bruch's membrane can result in hemorrhage without subretinal neovascularization, and ICGA is more sensitive in detecting the lacquer cracks than FFA. CONCLUSION: Subretinal neovascularization and the formation of lacquer cracks result in two forms of high myopia with macular hemorrhage. ICGA combined with FFA is more useful in evaluating the two forms of hemorrhage.

Adolescent↗
PubMedDate not supplied

Intracranial artery dissections: serial evaluation with MR imaging, MR angiography, and source images of MR angiography.

BACKGROUND AND PURPOSE: To assess chronological change in intracranial artery dissections with magnetic resonance imaging (MRI), MR angiography (MRA), and source images of MRA, and to determine whether the source images of MRA provide additional useful information to the combined evaluation of MRI and MRA. MATERIALS AND METHODS: Seven consecutive patients with intracranial artery dissections who were diagnosed by clinical history and conventional angiography were followed sequentially with MRI and MRA (mean follow-up duration, 8.8 months). Two observers independently reviewed the signal intensity of the arterial wall on T1-weighted images, luminal structures on MRA, and source images of MRA. RESULTS: In three (43%) of seven patients, the affected arterial wall had high signal intensity area from 4 to 62 days after onset on T-weighted images. Double lumen on MRA wasobserved only in one patient during the course of the study, whereas a definite low-intensity linear area in the lumen on source images of MRA was seen from 0 to 773 days after onset in all patients. When information from the source images of MRA was added to evaluation with both MRI and MRA, detectability increased to 100% from day 0 to day 3 and 67% from day 4 to day 30. CONCLUSION: The signal intensity of the dissected wall and the luminal structures on MRA and its source images vary according to chronological age. The use of source images from MRA in addition to the combined evaluation of MRI and MRA may provide more accurate diagnosis and follow-up study of intracranial artery dissections.

Adult↗
PubMedDate not supplied

Assessment of carotid artery stenosis by MR angiography: comparison with x-ray angiography and color-coded Doppler ultrasound.

PURPOSE: To compare magnetic resonance angiography (MRA) with duplex Doppler ultrasound (US) and x-ray angiography (XRA) in the evaluation of the carotid bifurcation. METHODS: The carotid arteries of 61 patients were studied using MRA, US, or XRA; 31 of the patients underwent all three examinations. MRA included both 2D and 3D time-of-flight sequences. Internal and external carotid artery origins were graded normal, mild, moderate, severe, or critical stenosis, or complete occlusion by each of the three studies. RESULTS: Spearman rank correlations of both internal and external carotid artery grades were 0.85 (MRA and XRA), 0.69 (MRA and US), and 0.73 (XRA and US). For internal carotid artery origins only, the correlations were 0.94 (MRA and XRA), 0.85 (MRA and US), and 0.82 (XRA and US). Of discrepancies in internal carotid artery interpretation greater than one grade, seven resulted from US error, three from MRA error, and one from XRA error. A 2-cm partially thrombosed aneurysm detected by US and MRA was missed by XRA. Of 16 possible ulcers on XRA, 11 were noted by MRA, none by US. CONCLUSIONS: MRA and XRA are similar in assessment of carotid bifurcation stenosis. MRA, like US, permits direct visualization of plaque. This preliminary study suggests that MRA may be used to clarify equivocal findings of US, or replace XRA in presurgical planning.

Aged↗
PubMedDate not supplied

Fluorescein angiography and indocyanine green angiography for identifying occult choroidal neovascularization in age-related macular degeneration.

PURPOSE: To assess whether fluorescein angiography (FA) alone without indocyanine green angiography (ICGA) can identify and localize occult choroidal neovascularization (CNV) in age-related macular degeneration (ARMD). METHODS: Seventy-nine eyes of 77 consecutive patients with occult CNV were evaluated independently by two skilled physicians at first with FA alone and then with FA combined with ICGA by fundus camera. RESULTS: The agreement between FA and ICGA was 73% and 68% for the two physicians (K=0.585 and 0.512, respectively). The first operator correctly identified 20/27 as plaque CNV; six had different sizes and locations. The second operator identified 25/30, with one mistaken for size and location. For focal CNV the first operator identified 34/39, and the second one 23/35. CONCLUSIONS: Comparing the FA results with ICGA, CNV was correctly identified in about 60% of cases. Therefore, ICGA should be considered an indispensable diagnostic test to identify the presence, the type, and the location of occult CNV.

Aged↗
PubMed2006

[Application of three-dimensional contrast-enhanced magnetic resonance angiography in renal artery angiography].

OBJECTIVE: To increase the probability of successful renal artery angiography with a three-dimensional contrast-enhanced magnetic resonance angiography (3D CE-MRA). METHODS: 3D CE-MRA was performed in 33 patients with hypertension. To calculate the scan delay time, a testing contrast agent bolus of 2 ml was injected for single sagittal slice real-time scanning, followed by oblique coronal 3D Fast TOF SPGRE. With maximum intensity projection, a set of images was acquired. RESULTS: Exact scan delay time was obtained in all the cases from which clear images were acquired with the exception of two cases in which failure of breath-holding occurred during the scanning. CONCLUSION: This examination enhances the performance by adopting elliptical-centric k-space recording for data acquisition for the center in k-space at the beginning of acquisition, and utilizing preceding testing bolus injection and signal intensity/time curve for determining the scan delay time, using slice selection and multiview image reconstruction.

Adolescent↗
PubMed1978

[Radiation dose in renal magnification angiography compared with conventional angiography (author's transl)].

Measurements of skin dose, integrated skin dose area, and integral dose in combined conventional and magnification renal angiography using lanthanoxibromide screens MR 600 and carbon fibre plate in filmchangertop have been made. The mean skin dose in magnification technique was 0.56 rad./film with focus-skin distance of 35 cm, FFD 1 m, 85-90 kV and sagittal diameter of abdomen of 20 cm. The combination of angiographic technique with and without magnification and the use of a high-sensitivity receiving unit makes it possible to keep the total skin dose per investigation (8.5 rad.) within the limits accepted in conventional abdominal angiography.

Angiography↗
PubMed2005

HLA-B52-positive vasculo-Behçet disease: usefulness of magnetic resonance angiography, ultrasound study, and computed tomographic angiography for the early evaluation of multiarterial lesions.

We report a case of HLA-B52-positive Behçet disease accompanied by multiarterial lesions. A 24-year-old woman was suffering from sporadic high fever and recurrent oral and genital ulcers, and laboratory data revealed severe inflammation. A diagnosis of Behçet disease was made. Magnetic resonance angiography, ultrasound study, and computed tomographic angiography demonstrated multiarterial lesions that had caused no symptoms. These noninvasive examinations were extremely useful in evaluating asymptomatic early vascular lesions.

Journal Article↗
PubMed1997

Intracranial dissecting aneurysm causing subarachnoid hemorrhage: the role of computerized tomographic angiography and magnetic resonance angiography.

BACKGROUND: With increasing frequency, dissecting aneurysms of the intracranial arteries are recognized as a possible cause of subarachnoid hemorrhage (SAH). In the presence of a dissecting aneurysm, angiographic changes may be subtle at presentation and correct diagnosis often requires serial angiograms. We report a patient with a dissecting aneurysm of the anterior cerebral artery (ACA) causing SAH, in whom less invasive diagnostic tools, such as high-resolution computerized tomographic angiography (CTA) and magnetic resonance angiography (MRA), were helpful in confirming the diagnosis and in following the evolution of the dissection. CASE PRESENTATION: We present this 51-year old woman who experienced the sudden onset of severe headache without associated neurological deficits. Head CT showed SAH with blood in the interhemispheric fissure, suggesting a ruptured ACA aneurysm. Serial cerebral angiograms failed to demonstrate an aneurysmal sac, but showed evolving irregularities of the ACA consistent with a dissecting aneurysm. These findings were confirmed by CTA and MRA. The patient was treated conservatively and made an excellent recovery. A MRA obtained 2 months later showed slight improvement of the previously visualized ACA dilatation. CONCLUSION: Serial angiograms are often required to confirm the diagnosis and to follow the evolution of an intracranial dissection. With recent advances in neuroradiological techniques, however, critical information can be obtained by less invasive imaging studies, such as CTA and MRA.

Aortic Dissection↗
PubMed1994

Noninvasive angiography in preoperative evaluation of complicated pediatric renal masses using phase contrast magnetic resonance angiography.

OBJECTIVES: To report a new technique called "phase contrast magnetic resonance angiography" (PC MRA) utilizing phase contrast magnetic resonance imaging, for assessing the renal vasculature in relation to complicated pediatric renal masses. METHODS: Three-dimensional phase contrast gradient refocused pulse sequences were obtained on four pediatric patients with complicated renal masses. Findings were compared to ultrasound and computed tomographic images and correlated with actual surgical anatomy. RESULTS: In all four cases PC MRA provided standard angiographic quality detail of the renal vascular anatomy. The PC MRA findings had a 100% correlation with surgical exploration and MRA proved to be approximately one third the cost of the standard angiographic technique. CONCLUSIONS: Our experience with the use of PC MRA in children suggests that it can be helpful in evaluating the vasculature of complicated pediatric renal masses. PC MRA utilizes current generation magnetic resonance units, is noninvasive, and does not require anesthesia. It may be especially useful in patients with hypersensitivity to contrast agents, in those with renal failure in whom contrast agents may be contraindicated, and is less expensive than standard angiography.

Child, Preschool↗
PubMed1985

Comparison of nephroangiotomography, intravenous subtraction angiography and digital subtraction angiography in the diagnosis of renal hypertension.

Nephroangiotomography (NATG), intravenous subtraction angiography (ISA) and digital subtraction angiography (DSA) were compared with regard to their specificity and diagnostic value, their expenditure of time, equipment and staff as well as to their risk for the patients. The interpretation of NATG is inferior to ISA. The hitting quota of ISA and DSA is equal. The expenditure of time and staff for ISA is important, whereas the equipment for DSA is considerable; however, it has a wider use. In case of a low patient number, ISA delivers sufficient results in the diagnosis of renal hypertension with the advantage that it can also be performed in smaller radiological institutes.

Humans↗
PubMedDate not supplied

Radionuclide angiography and Doppler sonography to detect patients with cerebrovascular disease. A correlation with radiographic angiography.

Cerebral radionuclide angiography with 99mTc pertechnetate (RNA) and directional Doppler sonography (DS) were employed to study patients with cerebrovascular disease (CBVD). The 86 patients investigated were divided following radiographic angiography (RGA) into normals (n = 26) and into patients with intracranial (n = 22) and extracranial (n = 38) vascular lesions. Of the patients with angiographically demonstrated CBVD, RNA detected 90%, DS 53.3%. The combined evaluation had a sensitivity of 93.3%. If intracranial arterial disease was excluded, the sensitivity of the studies was 92.1% for RNA and 84.2% for DS and combined evaluation had a sensitivity of 97.4%. The diagnostic accuracy by combined evaluation was 93.8% for the extracranial arterial lesions if the clinical findings were also used in patients with normal RGA pattern. RNA and DS complement each other as RNA contributes to the detection of intracranial blood flow alterations indicating vascular changes in either the extra- or intra-cranial vessels and helps confirm and complete DS findings.

Arterial Occlusive Diseases↗
PubMed1986

[Evaluation of digital subtraction angiography, ultrasonography and Doppler velocimetry versus conventional angiography in the femoral bifurcation].

Thirty patients were examined by 4 procedures, conventional angiography (C.A.), peripheric intravenous digital subtraction angiography (D.S.A.), ultrasonography and Doppler on femoral artery bifurcation. These arteries are divided into several sections on which findings were classified into three or five categories. There is an excellent correlation between conventional and digital angiograms. Various results of D.S.A. versus C.A. were obtained in 2% of these sections. More differences were noticed between C.A. and Doppler (7%), C.A. and ultrasonography (10%). There is a positive correlation of D.S.A. versus C.A. With Doppler and ultrasonography, arterial map is difficult to establish especially in case of many stenoses of the iliac arteries or thrombosis on femoral superficialis arteries.

Adult↗