Abstract:
HTML
Purpose: To assess the MPR image quality in variable reconstrution parameters with multislice helical CT in the head and neck neoplasms and to explore the optimal reconstruction parameters.
Methods and Materials: Sixty-seven patients with head and neck tumor were scanned with 1.25-mm collimation and pitch of 0.875 using GE Lightspeed Ultra 8 slices helical CT. All patients were divided into two groups. In the first group (n=28), 1.25-mm-thick and 2.5-mm-thick section with 50% section overlap were reconstructed, the MPR images were obtained with 1-mm, 2-mm, 3-mm, and 5-mm reformations. In the second group (n=39), 1.25-mm-thick section with 0%, 25%, 50%, and 75% section overlap were reconstructed, while the MPR images were obtained with 1-mm reformation. The images of each group were submitted to two blinded radiologists who separatedly ranked them from best to worst.
Results: In the first group , the MPR image quality of 1-mm reformation with 1.25-mm reconstruction was superior to the others to reveal soft tissue, lesion, and bone (P<0.01). The artifacts viewed on MPR images were slight and had no influence on diagnosis. In the second group, the MPR image quality of 50% section overlap was similar to 75% section overlap (P>0.05) and superior to the others to reveal soft tissue and lesions , was inferior to 75% section overlap to reveal bone (P<0.05) , was less than 75% slice overlap in artifacts (P<0.01).
Conclusion: 1.25-mm-thick reconstruction with 50% section overlap and 1-mm reformation were the optimal parameters to reveal soft tissue, lesion, bone , and had less artifacts in the MPR images with multislice helical CT in the head and neck neoplasms.
Questions about this event email: liangy_2000@sina.com
Liang MD, PhD, Y,
Multislice Helical CT: The Quality of Multiplanar Reconstruction Images Using Variable Reconstruction Parameters with Multislice Helical CT in Head and Neck Neoplasms. Radiological Society of North America 2003 Scientific Assembly and Annual Meeting, November 30 - December 5, 2003 ,Chicago IL.
http://archive.rsna.org/2003/3103977.html
