Hannu I Manninen

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For broad-based intracranial aneurysms, both surgical and endovascular treatments are demanding. Flexible metallic stents provide an alternative treatment option for these patients, because they enable coil placement through the stent mesh. Evidence from extracranial arteries indicates that aneurysms may also spontaneously thrombose after stent placement.(More)
OBJECTIVE To analyze the frequency and severity of subclinical cerebral complications associated with coronary artery bypass grafting (CABG). DESIGN A prospective controlled study using preoperative and postoperative magnetic resonance imaging (MRI) of the brain, quantitative electroencephalography (QEEG), and detailed neuropsychological and neurologic(More)
BACKGROUND AND PURPOSE Compared with the single-detector technique, multi-detector row CT angiography permits larger anatomic coverage that includes both the epiaortic and entire carotid circulations. We evaluated the accuracy of multi-detector row CT angiography by using multiplanar reformation (MPR) for measuring carotid artery diameters compared with(More)
BACKGROUND Back problems are reported more by occupational drivers than by any other occupational group. One explanation is that whole-body vibration caused by the vehicle leads to accelerated disc degeneration, herniation, and associated symptoms. We aimed to investigate the effects of lifetime driving exposure on lumbar disc degeneration in monozygotic(More)
BACKGROUND The flow-diverting stent is a new option in endovascular therapy specifically designed for the endovascular reconstruction of a segmentally diseased artery. The safety of flow-diverting stents is still equivocal. OBJECTIVE To evaluate the technical aspects, thromboembolic events, adjunctive therapies, and midterm results in patients with(More)
PURPOSE To evaluate different carotid stenosis estimation methods with digital subtraction angiography. METHODS We assessed the intraobserver reproducibilty and interobserver variability of visual interpretation and the measurement methods used by the European Carotid Surgery Trial and the North American Symptomatic Carotid Endarterectomy Trial.(More)
BACKGROUND AND PURPOSE Our aim was to evaluate the usefulness of 3-dimensional time-of-flight magnetic resonance angiography (3-D TOF MRA) in detection and quantification of mild atherosclerotic changes of carotid arteries with reference to intravascular ultrasound (IVUS) and contrast angiography. METHODS TOF MRA at 1.5 T, IVUS, and selective digital(More)
PURPOSE To evaluate the prevalence of anatomical variations in the circle of Willis predisposing to cerebral ischemia during intraoperative closure of a carotid artery. MATERIALS Anatomy of the cerebral arteries of 92 deceased was assessed by angiography and permanent silicone casts. Cerebral ischemia during closure of a carotid artery with patent(More)
PURPOSE To determine the most accurate, safe, and cost-effective imaging protocol for selecting patients for carotid endarterectomy. METHODS The actual costs of carotid angiography, ultrasound, and MR angiography were calculated. The diagnostic accuracy with different confidence levels was assessed for carotid ultrasound and MR angiography in 45 patients.(More)
The suitability of the cerebrospinal fluid (CSF) in the lumbosacral dural sac as an internal signal-intensity reference was studied on magnetic resonance imaging (MRI) of the lumbar spine using a surface coil and motion artefact suppression technique. A signal-intensity reference is needed when signal is compared between images, studies or subjects.(More)