Journal of neuroimaging : official journal of the American Society of Neuroimaging
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Due to the geometry of linear array transducers and the anatomy of the supraclavicular, and jugular fossa it is often impossible to get an appropriate ultrasonic view of the intrathoracic segments of the supraaortic arteries and their origin from the aortic arch. We aimed to compare a conventional linear with a microconvex array transducer for their ability to visualize these vessel segments. ⋯ Due to its much smaller contact surface, the microconvex array transducer revealed a better and more extended view of the intrathoracic segments of the supraaortic arteries and the aortic arch.
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Microbubbles (MB) and ultrasound have been shown to enhance thrombolysis. We sought to evaluate safety and efficacy on middle cerebral artery (MCA) recanalization of local MB administration during intra-arterial (IA) thrombolysis and continuous transcranial Doppler (TCD) monitoring. ⋯ The combination of ultrasound and IA MB and tPA may be a strategy to enhance the thrombolytic effect and increase recanalization rates.
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Multiple system atrophy (MSA) is a progressive neurodegenerative disorder divided into a parkinsonian (MSA-P) and a cerebellar variant. The purpose of this study was to assess regional brain atrophy and iron content using Voxel-based morphometry (VBM) and Voxel-based relaxometry (VBR) respectively, in MSA-P. ⋯ Diffuse brain atrophy, mainly in the motor circuitry is observed in MSA-P. Normalization for atrophy should always be performed in T2 measurements.
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In neuroimaging studies of dementia and mild cognitive impairment, hippocampal atrophy (HA) is commonly assessed by qualitative ratings of hippocampal appearance, or by measuring hippocampal volumes. These estimates of HA are considered to be equivalent. However, few studies have examined their relationship, especially in healthy older individuals. We therefore examined the relationship between hippocampal qualitative atrophy scores and quantitative volumetric measurements in healthy older men. ⋯ This study shows that qualitative and quantitative indices of hippocampal atrophy in healthy older men are not equivalent. Small hippocampal volumes do not necessarily equate to hippocampal atrophy.