[Computed tomography of the paranasal sinuses in coronal section--a prerequisite for endonasal surgery].
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Aged↗
Biomedical subjects
S Kösling
Publications and source records attributed to S Kösling.
[Experiences in emergency bedside and ambulatory ultrasonography].
A retrospective study of 147 emergency sonographic examinations performed at our department between March 1989 and February 1990 showed a good agreement with operation results, autopsies respectively punctures. Several cases were discussed. The obtained relevance of therapy of about 75% emphasizes the demand that sonography must be the method of first choice in emergency diagnostic.
Adolescent↗
Misleading changes of the signal intensity on opposed-phase MRI after injection of contrast medium.
OBJECTIVE: The effect of opposed-phase imaging on the interpretation of MR contrast studies is highlighted. MATERIALS AND METHODS: A model calculation is performed. It demonstrates the change of signal intensity of an average tumor before and after application of Gd-DTPA on an in-phase and an opposed-phase image, depending on the percentage of fat within the voxels. The effect is then demonstrated, using a small cotton stick soaked with water or a solution of contrast agent representing a tumor before and after i.v. application of Gd-DTPA. RESULTS: If an average enhancing tumor, which is surrounded by fat, occupies less than 50-60% of the slice thickness, it becomes undetectable on opposed-phase images. The reason is that due to signal cancellation on the opposed image, no signal change or even signal decrease results, while signal increase is visible on the in-phase image. CONCLUSION: In those areas of the body where significant partial volume of a tumor with fat may occur (such as for breast tumors growing along ducts, which are surrounded by fat), severe errors can result. Therefore we explicitly warn from using opposed-image sequences for MR contrast studies.
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