Der Radiologe
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Dissections due to deceleration trauma are rarely limited to the infradiaphragmal aorta (only 2-3%) and are usually lethal. Here we report the unusual course of an abdominal aortic dissection with aneurysmatic enlargement of the false lumen. ⋯ During the intervention sondation of the false lumen revealed that the left renal artery had a reentry. Due to the complexity of the entry-reentry situation of the left renal artery the intervention was not possible, and the patient had to undergo vascular surgery.
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Aim of the study was to investigate alveolar inspiration and expiration using multiscan CT. Results of a visual assessment using a scoring system were compared with density ranges known to represent alveolar ventilation best. ⋯ Dynamic multiscan CT allows for determining different ventilation-relevant lung compartments and lung density ranges.
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Comparative Study
[HIRE (high intensity reduction). New cerebrospinal fluid suppressed T2-weighted imaging sequence].
The HIRE sequence utilizes the very long T2 value of CSF to suppress its high signal contribution in T2-weighted imaging by an image subtraction technique. ⋯ The presented T2 based HIRE sequence is an alternative to the T1 based FLAIR sequence with the advantage of a better gray to white matter contrast and shorter measurement time. Due to the subtraction technique signal intensities from tissues with T2 relaxation times in the range between white matter and CSF are also partially affected depending on their T2 values. With respect to this undesired effect, an improvement in HIRE imaging will be expected by a self-weighted subtraction algorithm.