ABSTRACT
PURPOSE: To determine whether computed tomographic (CT) angiography with the volume-rendering technique (VRT) can be used to accurately quantify carotid arterial stenosis and to identify occlusions. MATERIALS AND METHODS: Spiral CT was performed in 23 patients who were referred for carotid stenosis evaluation. VRT images and shaded-surface display (SSD) images of 46 carotid arterial bifurcations were compared with findings from digital subtraction angiography (DSA). RESULTS: Agreement on stenosis category between VRT CT angiography and DSA was found in 39 (85%) of the 46 carotid arteries studied. VRT CT angiography was 92% (49 of 53) sensitive and 96% (82 of 85) specific for the detection of grade 2-3 stenoses (> or = 70% stenosis). Agreement on stenosis category between SSD CT angiography and DSA was found in 38 (83%) of the 46 carotid arteries studied. SSD CT angiography was 91% (48 of 53) sensitive and 93% (79 of 85) specific for the detection of grade 2-3 stenoses. Calcified stenoses were correctly graded at VRT CT angiography in 10 of the 10 cases with heavy mural calcified plaques, while eight of the 10 stenoses were accurately quantified at SSD CT angiography. CONCLUSION: These results indicate that VRT CT angiography is as accurate as SSD CT angiography in the evaluation of carotid arterial bifurcations.
Subject(s)
Carotid Arteries/diagnostic imaging , Carotid Stenosis/diagnostic imaging , Tomography, X-Ray Computed/methods , Aged , Aged, 80 and over , Angiography, Digital Subtraction , Female , Humans , Image Processing, Computer-Assisted , Male , Middle Aged , Observer Variation , Sensitivity and SpecificitySubject(s)
Abdominal Injuries/complications , Aneurysm, False/etiology , Aortic Aneurysm, Abdominal/etiology , Wounds, Gunshot/complications , Adult , Aneurysm, False/diagnostic imaging , Aortic Aneurysm, Abdominal/diagnostic imaging , Humans , Male , Tomography, X-Ray Computed , Ultrasonography, Doppler, ColorSubject(s)
Meckel Diverticulum/diagnostic imaging , Adult , Female , Humans , Meckel Diverticulum/pathology , UltrasonographyABSTRACT
Distinguishing between osteomyelitis and neuropathic osteoarthropathy of the foot frequently presents a clinical and radiologic challenge in patients with diabetes. Magnetic resonance (MR) imaging was performed in 26 diabetic patients to observe changes in signal intensity in the complicated diabetic foot. In every patient with osteomyelitis (n = 13), signal intensity abnormalities were seen within the bone marrow (low signal intensity on T1-weighted images and high signal intensity on T2-weighted images in 12 cases). Most of these patients had cortical lesions (n = 9) or associated soft-tissue infection (n = 12). Normal bone marrow signal intensity was observed in three of the four patients without osteomyelitis. Characteristic MR imaging findings (decreased signal intensity in bone marrow regardless of pulse sequence) were seen in patients with chronic neuropathic osteoarthropathy (n = 7), who were easily distinguished from patients with osteomyelitis. Conversely, in patients with acutely evolving neuropathic osteoarthropathy (n = 2), signal intensity changes within the bone marrow were similar to those observed in osteomyelitis, leading to potential diagnostic pitfalls. Familiarity with MR imaging findings observed in osteomyelitis and neuropathic osteoarthropathy can help identify these two entities, allowing early diagnosis and appropriate therapy.
Subject(s)
Arthropathy, Neurogenic/diagnosis , Diabetic Foot/diagnosis , Magnetic Resonance Imaging , Osteomyelitis/diagnosis , Aged , Arthropathy, Neurogenic/complications , Bone Marrow/pathology , Bone and Bones/pathology , Chronic Disease , Diagnosis, Differential , Female , Foot/pathology , Humans , Male , Middle Aged , Osteomyelitis/complications , Soft Tissue Infections/complications , Soft Tissue Infections/diagnosisABSTRACT
A retrospective study of 95 patients was undertaken to compare digital subtraction angiography (DSA) and conventional arteriography of the hand. Eighty patients had conventional angiography and 15 had DSA. In comparison with conventional angiography, DSA is more cost-efficient and facilitates outpatient angiography. It provides images as acceptable as those of conventional angiography. We conclude that intra-arterial DSA is now the procedure of choice for angiographic mapping of the digital arteries.
Subject(s)
Angiography/methods , Fingers/blood supply , Subtraction Technique , Adolescent , Adult , Aged , Angiography/economics , Arteriosclerosis Obliterans/diagnostic imaging , Embolism/diagnostic imaging , Female , Hand/blood supply , Humans , Ischemia/diagnostic imaging , Male , Middle Aged , Retrospective Studies , Subtraction Technique/economics , Thromboangiitis Obliterans/diagnostic imagingABSTRACT
In chondrosarcomas, angiography may be helpful in confirming malignancy, delineating the anatomic extent and detecting recurrence. The angiographic findings in three chondrosarcomas are demonstrated including a vertebral one, abrupt narrowing of tumor vessels, neovascularlity and accumulation of contrast medium during the capillary phase. Changing calibre of arteries and neovascularity are better seen on selective angiograms and after subtraction technique.
