We assessed improvements in performance in detection and estimation tasks due to a novel brain single photon computed tomography collimator. Data were acquired on the CeraSPECT scanner using both new and standard collimators. The new variable focusing collimator SensOgrade samples the projections unequally, with central regions more heavily represented, to compensate for attenuation of counts f...

Types of imaging Brain imaging techniques currently used in the UK for the clinical assessment of dementia are grouped into three categories: structural, functional and molecular. Structural imaging includes computed tomography (CT) and magnetic resonance imaging (MRI). The images produced by these methods allow one to see the anatomical ‘structure’ of cerebral tissue. They are used to detect a...

OBJECTIVES The pathophysiology of dysarthria can preferentially be studied in patients with the rare lacunar stroke syndrome of "isolated dysarthria". METHODS A single study was carried out on seven consecutive patients with sudden onset of isolated dysarthria due to single ischaemic lesion. The localisation of the lesion was identified using MRI. The corticolingual, cortico-orofacial, and co...