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Biomedical subjects

O Kotterer

Publications and source records attributed to O Kotterer.

5 recordsLinked to original sources
PubMed1993

[Dynamic cranial CT in ischemic cerebral lesions].

58 patients with recent transient or permanent neurologic deficits of with proven carotid stenoses were examined by dynamic CT at the level of the internal capsule. In the presence of cerebral infarcts there was marked delay in the time/density curve with reduced peaks. Abnormal perfusion could be demonstrated by early examinations before definite morphological changes were seen. With transient ischaemic attacks there were no significant changes in perfusion; in the presence of carotid stenoses the results were variable. The perfusion abnormalities in the hemispheres shown by dynamic cranial CT could be confirmed to some extent by 99mTc-HMPAO-SPECT.

Adult↗
PubMed1991

[Problems in recognizing recurrences of craniocervical malignancies in CT].

A retrospective study was carried out involving 39 patients with malignant tumours of the head and neck in order to differentiate by CT changes due to local tumour or lymph node recurrences and various post-operative or post-irradiation changes. In these patients, two or more CT examinations of the neck were available, derived from a fourth generation scanner. The suspected lesions were classified according to their type and the appearances correlated with the treatment and clinical findings. There was frequent overlap between the appearances of benign and malignant changes, so that in individual cases a definite decision often proved impossible.

Adult↗
PubMed1989

[Determination of the value of conventional and computer-assisted tomography in examining the thoracic organs].

We compared the results of CT and conventional tomography examinations of the thorax of 137 patients with each other and with the final results. In the diagnosis of bronchial carcinomas we found no significant differences between the two methods. In all other investigated items CT proved to be superior to conventional tomography, especially of the evaluation of mediastinum (90% vs. 35%). We conclude that CT is the method of choice in the staging of intrathoracic tumours and especially in the evaluation of hilar and mediastinal masses and there is no need for conventional tomography in these cases.

Carcinoma, Bronchogenic↗
PubMedDate not supplied

Cranial CT artifacts and gantry angulation.

Computed tomographic investigation of the brain is frequently accomplished by scanning parallel to the canthomeatal line. In these scans, evaluation of the brain stem and neighboring structures is often compromised by streak artifacts from bone-induced beam hardening. These artifacts may be reduced by introducing a change in gantry angulation. Results from a phantom study as well as from a clinical trial offer evidence that may be helpful in assessing different scanning planes. An inclination of 5 degrees below Reid baseline is suggested to minimize the interpetrous artifact. Variations in slice thickness and exposure parameters do not appear to affect significantly this typical posterior fossa artifact.

Algorithms↗