Der Radiologe
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Transvaginal ultrasound is the method of first choice in patients with a suspected ovarian tumor. Computed tomography (CT) and magnetic resonance (MR) imaging are supplementary imaging procedures for the diagnostic evaluation of ovarian tumors. The major indications for a CT or MR examination are unclear ultrasound findings, the differential diagnosis of lesions and tumor staging. ⋯ CT and MR imaging use identical morphological criteria for the differentiation of benign and malignant ovarian tumors; MR imaging is not superior to CT. For the staging of ovarian carcinomas, CT is the preferred imaging procedure. Contrast-enhanced MR imaging might be better for the evaluation of peritoneal carcinosis than other modalities.
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Salivary gland tumors are rare. One-fifth are malignant. The parotid is the gland most often affected, particularly in adenomas. ⋯ Aggressive and extensive tumors are irradiated postoperatively. Malignancies not operated upon are irradiated primarily. Facial nerve paralysis can be rehabilitated by different nerve repair or static surgical techniques.
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Comparative Study
[The MR phase contrast method. Determination of blood flow velocity and flow profile of intracranial arteries].
2D-phase-contrast mapping is a MR method that allows for quantitative measurements of blood flow velocity in intracranial vessels. Using a modified FISP-Sequence with a 1.5 T MR scanner, flow studies were carried out on a phantom. Two matrix sizes (256 x 256 vs. 256 x 512) were compared. ⋯ The blood flow velocity in the MCA determined by 2DPK was lower than the TCD values. Using a 256 x 512 matrix, the acquired data were in better accordance with the TCD findings. Due to significant noise measurements of the ACA and PCA were frequently degraded.
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Measurements of blood flow velocity in the basal cerebral arteries during functional testing by means of transcranial Doppler sonography are reviewed. Special emphasis is placed on cerebrovascular reserve capacity, which we determined in two groups of patients with obstructive cerebrovascular disease and in normal persons. We discuss the value of functional testing during endovascular neuroradiological procedures.