Multislice computed tomography of the sternum: which image reconstruction do we need?
OBJECTIVE
To assess the diagnostic value and to optimize image reconstruction for multislice spiral computed tomography (MSCT) of the sternum.


METHODS
Forty patients underwent MSCT of the sternum using a standardized examination protocol (4x1 mm or 4x2.5 mm collimation; 120 kV, 120 mAseff). Axial images with an effective slice thickness of 1.25 mm or 3 mm and an increment of 0.8 mm or 1 mm were reconstructed. Coronal and sagittal reformations with a slice thickness between 2 mm or 3 mm and 5 mm and a slice distance ranging from 1 mm to 4 mm (overlap 1 mm) were calculated. In all patients, additional plain film radiographs (n=9) or clinical follow-up data were available. Image quality was assessed visually using a five-point grading scale.


RESULTS
In all patients, the correct diagnosis was established using multiplanar reformats (MPR) exclusively. Best image quality for MPR was achieved using a slice thickness of 3 mm and a slice distance of 2 mm. Images acquired with a 4x1 mm collimation proved superior to images reconstructed from data obtained with a 4x2.5 mm collimation.


CONCLUSIONS
MPR from MSCT data are a valuable tool for the diagnosis of sternal pathologies. For best image quality the thinnest possible collimation should be chosen.
Department of Diagnostic Radiology, Aachen University of Technology, University Hospital, Germany.
Pascal
P
Niggemann
Joachim E
JE
Wildberger
Rolf W
RW
Günther
Andreas H
AH
Mahnken
D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008297:Male; D008875:Middle Aged; D011829:Radiation Dosage; D012189:Retrospective Studies; D013249:Sternum / Q000000981:diagnostic imaging* / Q000473:pathology; D036542:Tomography, Spiral Computed