Utility of Thoracolumbar Low-Dose CT With Model-Based Iterative Reconstruction for Measuring Pedicle Diameter Using a Radiation Dose Less Than a One-Time Lumbar X-Ray
| Autor: | Yu Shimizu, Yasuhiro Fukushima, Kazutaka Masamoto, Shunsuke Fujibayashi, Shuichi Matsuda, Kentaro Hara, Takayoshi Shimizu, Koji Koizumi, Bungo Otsuki, Koichi Murata, Kazuaki Morizane |
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| Rok vydání: | 2019 |
| Předmět: |
Adult
Male Image quality Iterative reconstruction Signal-To-Noise Ratio Radiation Dosage 03 medical and health sciences 0302 clinical medicine Lumbar Medicine Low dose ct Humans Orthopedics and Sports Medicine Retrospective Studies 030222 orthopedics business.industry X-Rays Radiation dose X-ray Thoracolumbar spine Reproducibility of Results Middle Aged Spine Child Preschool Radiographic Image Interpretation Computer-Assisted Female Neurology (clinical) Tomography Nuclear medicine business Tomography X-Ray Computed 030217 neurology & neurosurgery |
| Zdroj: | Spine. 45(1) |
| ISSN: | 1528-1159 |
| Popis: | Retrospective.To evaluate the image quality of low-radiation-dose computed tomography (LD-CT) of the thoracolumbar spine, using model-based iterative reconstruction (MBIR) for measuring pedicle diameter.MBIR can drastically reduce radiation dose but its utility in spine surgery planning is unknown.We identified patients (mean age, 70.5 ± 13.3 yrs) who incidentally underwent both standard-radiation-dose CT (SD-CT) with hybrid iterative reconstruction and LD-CT with MBIR of the thoracolumbar spine within 2 years. We compared radiation dose, subjective image sharpness, signal-to-noise ratio, and contrast-to-noise ratio for the two tests. Additionally, inner pedicle diameters were measured on SD-CT (DSD) and LD-CT (DLD), and statistically compared.We included 24 CT and 84 pedicles for each CT group. The radiation dose of LD-CT estimated by volume CT dose index was 1.21 ± 0.42 mGy, one-sixth the dose of SD-CT. The effective dose of LD-CT was 0.58 ± 0.31 mSv, equivalent to or less than that of a one-time lumbar X-ray in a previous report. LD-CT was significantly inferior in subjective image sharpness for the contour of vertebrae and trabecular structure, but superior for signal-to-noise ratio and contrast-to-noise ratio. The intra-rater reliability (intra-RR) and inter-RR for DLD were 0.985 and 0.892, respectively, comparable to those of DSD. DLD was consistently 0.30 mm smaller than DSD when compared within the same pedicle, regardless of pedicle diameter.LD-CT with MBIR produced a radiation dose equivalent to a one-time lumbar X-ray and provided excellent images for measuring pedicle diameter. LD-CT can be a substitute for SD-CT when planning spine surgery if the relationship between DSD and DLD is sufficiently understood.3. |
| Databáze: | OpenAIRE |
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