Der Radiologe
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The diagnosis of benign bone tumors can cause many problems and a definitive histological diagnosis is often impossible without the knowledge of clinical datas, age of the patient and anatomical location of the tumor. Therefor cooperation between pathologist, orthopedic surgeon and radiologist is necessary, to reduce the risk of misinterpretation of benign and malignant bone tumors. Benign bone tumors often show a heterogenous histology and overlapping morphology between different entities has to be kept in mind, as well as the sampling error in biopsy- and frozen section material. In most cases the pathologist has to rely on conventional stainings because the immunohistochemistry stainings are often not helpful.
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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.