Dual-Layer Spectral Detector CT Discography of the Lumbar Spine: A Preliminary Study
Purpose To assess the feasibility of spectral detector CT (SDCT) with axial maximum-intensity projection (MIP) reconstruction for the evaluation of lumbar CT discography. Materials and Methods We retrospectively evaluated 44 disc levels from 18 patients who underwent CT discography on a dual-layer...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
The Korean Society of Radiology
2019-01-01
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| Series: | 대한영상의학회지 |
| Subjects: | |
| Online Access: | https://doi.org/10.3348/jksr.2019.80.1.105 |
| Summary: | Purpose To assess the feasibility of spectral detector CT (SDCT) with axial maximum-intensity
projection (MIP) reconstruction for the evaluation of lumbar CT discography.
Materials and Methods We retrospectively evaluated 44 disc levels from 18 patients who underwent CT discography on a dual-layer SDCT between May 2016 and July 2017. We compared
the distribution of contrast material between conventional CT and SDCT-based iodine maps
using the Jaccard index (JI) and Dice similarity coefficient (DSC). Qualitative analysis of the
post-discogram features was done according to the Dallas discogram description, and changes in reading time and diagnostic confidence were analyzed.
Results The intermethod variability between conventional CT and SDCT was good, with a mean
DSC of 0.93 and a mean JI of 0.87. The mean sensitivity and positive predictive value of the
SDCT-based method were 90% and 96%, respectively. The addition of SDCT-based axial MIP iodine maps increased the diagnostic confidence (p = 0.025) and reduced the reading time in both
reviewers (p < 0.001).
Conclusion SDCT discography demonstrates the distribution of contrast medium within the
disc similarly to conventional CT. Additionally, axial MIP iodine maps using SDCT allow for the
fast evaluation of disc pathology with reduced reading time and can increase diagnostic confidence. |
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| ISSN: | 1738-2637 2288-2928 |