Double-helix scans aid diagnosis in infants.
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Biomedical subjects
T Fleiter
Publications and source records attributed to T Fleiter.
Pulmonary nodules in spiral volumetric and single slice computed tomography.
Single slice acquisition of conventional CT and volume scanning of spiral volumetric CT are compared in terms of detection and assessment of pulmonary nodules. Spiral CT is supposed to be superior to conventional CT in detecting all lung nodules by scanning the complete lung volume, while conventional CT may miss nodules due to inconsistent levels of inspiration for single slices. Different technical procedures of spiral CT may change the imaging of nodules and other findings. Fifty-two patients with known or suspected lung nodules were examined by conventional CT and spiral CT. Number and size of lung nodules and imaging of other pulmonary findings were registered independently by two radiologists. Spiral CT showed 15 lung nodules not seen on conventional CT, and missed one nodule. Spiral CT imaging of nodules was superior in some cases (characterisation of benign nodules) because complete scanning provided more information than conventional CT. It was worse in some cases (small nodules, fibrosis, small pleural effusion) due to the greater partial volume effect and less mAs. Technically improved spiral CT with longer scanning facilities and a 180-degree algorithm may be able to replace conventional CT for this indication.
Humans↗
[Evacuation proctography: physiological variability and clinical relevance of the anorectal angle and the position of the pelvic floor].
Evacuation proctography is an important imaging method for the investigation of abnormalities of defecation. For this procedure, the most commonly carried out measurements are the ano-rectal angle and the position of the pelvic floor. The given mean values and the physiologically acceptable deviations vary just as much as the perceived clinical value of these measurements. 173 evacuation proctograms were evaluated in a prospective study; the subjective abnormalities were correlated with clinical findings. No significant correlation between the measurements from the proctograms and the clinical findings could be determined. The clinical relevance of these measurements is, therefore, uncertain.
Adult↗
[Dynamic 3D imaging of peripheral vessels using color-coded Doppler ultrasound].
3-D reconstructions are established as post-processive methods in CT and MRI. However, these methods permit assessment of morphological findings only. To uncover functional relations on the basis of ultrasound would also be of paramount interest. For this purpose a specific method was developed for the acquisition and time-coded 3-D reconstruction in the diagnosis of peripheral vessels, in particular of the extracranial carotid artery. An imaging device (Acuson 128 XP) with a 7.5 MHz probe, a PC-controlled stepping motor and an imaging system (Kontron Mipron) was used. Data acquisition was performed scan-by-scan in a transverse plane with a slice thickness of 1 mm along the vessel. In every slice position multiple ECG-trigger delays during the cardiac cycle were used. Data were transferred to the imaging system via videosignal. In preliminary clinical application this dynamic 3-D reconstruction method yielded good spatial resolution of the complex physiological flow phenomena in the carotid bifurcation.
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[Portal computed tomography. Methodology and indications].
CT arterioportography (CTAP) requires intra-arterial contrast material via the superior mesenteric (splenic) artery. Malignant hepatic tumors are characterized by arterial vascularization and only minimal portal blood supply. Portal contrast therefore reveals small tumors with a high sensitivity of 68-87%. Sensitivity is higher in metastatic tumors than in hepatocellular carcinomas. CTAP is the method of choice for evaluation of the number, size and location of hepatic tumors prior to surgical intervention. If the findings are unclear, additional magnetic resonance imaging and sonography during the operation are useful.
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