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[Spiral CT in arytenoid cartilage dislocation: the optimization of the study parameters with a cadaver phantom and
J Rodenwaldt1, H H Niehaus, L Kopka
1Abteilung Röntgendiagnostik, Klinikum, Georg-August-Universität Göttingen.
Purpose:
To evaluate an optimal scan protocol in a cadaver phantom and its clinical assessment in 40 patients.
Materials And Methods:
In a cadaver larynx phantom helical CT (HiSpeed Advantage; GE, Milwaukee, Wis) was performed with increasing collimation (1-10 mm) and pitch (1.0-3.0). 40 patients with an immobile vocal cord were randomly assigned to undergo CT with a certain protocol.
Results:
Best resolution was obtained with a collimation of 1 mm and pitch 1. The pitch could be increased up to 2 without losing information. With a collimation of 3 mm and higher, anatomical details were missed. In the patient studies a combination of 1 mm collimation with a pitch of 2.0 showed less motion artifacts than a pitch of 1.0.
Conclusion:
The quality of CT imaging of the arytenoid cartilage depends greatly on the scanning parameters, the compliance of the patients and the mineralisation of the cartilage. For clinical assessment a collimation of 1 mm with a pitch of 2 is recommended. The increase pitch has the advantage of shorter acquisition times and decreased radiation exposure.