Faculty Collaboration Database

Temporal bone: comparison of isotropic helical CT and conventional direct axial and coronal CT. AJR Am J Roentgenol 1999 Jun;172(6):1675-82

Date

06/01/1999

Pubmed ID

10350314

DOI

10.2214/ajr.172.6.10350314

Scopus ID

2-s2.0-0033016205 (requires institutional sign-in at Scopus site)   39 Citations

Abstract

OBJECTIVE: The objective of the study was to compare helical CT (with reformation of coronal images from the axial data set) with conventional direct axial and coronal CT of the temporal bones.

SUBJECTS AND METHODS: Nineteen patients underwent both conventional 1-mm direct axial and coronal CT and helical 0.5-mm axial CT. The helical data set was reconstructed at 0.2-mm increments, and axial and coronal images were reconstructed in a plane similar to that of the conventional study, with a slice width of 0.5 mm and 0.5-mm increments. Forty small structures were evaluated independently by three observers, who were unaware of the method of imaging. Observers graded the 40 structures using a modified Likert scale. The graded differences between the two techniques were evaluated using a paired t test. Correlation between observers' gradings was evaluated using analysis of variance.

RESULTS: The helical CT technique scored significantly higher than the conventional technique for many individual structures and groups of structures (scutum [p = .041], stapes footplate [p = .006], stapes crura [p = .004], oval window [p = .026], crista falciformis [p = .006], whole temporal bone [P = .012], middle ear [p = .033], inner ear [p = .021], ossicles [p = .044], and stapes [p = .010]). The correlation coefficient among observers was .91 for the whole temporal bone.

CONCLUSION: Helical CT using 0.5-mm technique and reconstruction produces diagnostic images comparable with or superior to conventional 1-mm technique because helical CT can obtain thinner slices.

Author List

Caldemeyer KS, Sandrasegaran K, Shinaver CN, Mathews VP, Smith RR, Kopecky KK

Author

Vincent Mathews MD Chair, Professor in the Radiology department at Medical College of Wisconsin

MESH terms used to index this publication - Major topics in bold

Adolescent
Adult
Analysis of Variance
Bone Diseases
Child
Child, Preschool
Female
Humans
Infant
Male
Middle Aged
Observer Variation
Pilot Projects
Temporal Bone
Time Factors
Tomography, X-Ray Computed