Article Figures & Data
Figures
- Fig 1.
37-year-old male patient with follow-up neck CT for lymphoma at 70 kVp (A, C, E) and corresponding previous CT at 120 kV (B, D, F) at 3 anatomical levels. Note the diagnostic image quality with a higher contrast-to-noise ratio of cervical soft tissues at 70 kVp at all levels.
- Fig 2.
42-year-old male patient with follow-up neck CT for lymphoma at 70 kVp (A) and corresponding previous CT at 120 kVp (B). Sagittal reconstructions of the cervical spine demonstrate more image noise in the lower spine at 70 kVp in comparison to 120 kVp. Corresponding axial images through the lower neck (level of C7) at 70 kVp (C).
- Fig 3.
Measurements of cervical vessel (A) and muscle (B) attenuation, image noise (C), and the calculated contrast-to-noise ratio (D). Mean from both readers was taken for analysis.
Tables
- Table 1:
Image quality and artifacts of the cervical soft tissues and bones at 70 kVp and 120 kVp
70-kVp protocol (n = 20) 120-kVp protocol (n = 20) P Value* Reader 1 Reader 2 Reader 1 Reader 2 Reader 1 Reader 2 Image quality: soft tissue Overall 3.92 ± 1.05 3.85 ± 1.07 4.05 ± 0.77 3.86 ± 0.85 0.211 0.606 Upper third 3.20 ± 1.11 3.15 ± 1.09 3.45 ± 0.76 3.45 ± 0.76 0.135 0.055 Middle third 4.95 ± 0.22 4.95 ± 0.22 4.60 ± 0.50 4.40 ± 0.50 0.015 0.001 Lower third 3.60 ± 0.60 3.45 ± 0.60 4.00 ± 0.46 3.85 ± 0.49 0.017 0.008 Image quality: bone Overall 3.89 ± 1.18 3.51 ± 1.12 4.33 ± 0.70 4.19 ± 0.70 <0.001 <0.001 Upper third 4.35 ± 0.49 4.30 ± 0.47 4.42 ± 0.51 4.16 ± 0.68 0.578 0.414 Middle third 4.50 ± 0.51 4.45 ± 0.60 4.84 ± 0.38 4.68 ± 0.49 0.276 0.058 Lower third 2.75 ± 1.16 2.65 ± 1.16 3.74 ± 0.73 3.74 ± 0.65 <0.001 <0.001 Artifacts Soft tissue and spine 3.95 ± 1.04 3.70 ± 1.11 4.20 ± 0.82 4.03 ± 0.97 <0.001 <0.001 Upper third 3.15 ± 1.04 3.05 ± 1.00 3.55 ± 0.90 3.25 ± 1.03 0.509 0.09 Middle third 5.00 ± 0.00 5.00 ± 0.00 4.95 ± 0.23 5.00 ± 0.00 0.33 0.33 Lower third 3.55 ± 0.69 3.35 ± 0.49 4.10 ± 0.45 3.85 ± 0.49 0.002 0.042 -
↵* P values comparing 70-kVp and 120-kVp scans in the same 20 patients.
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- Table 2:
Comparison of CTDIvol, DLP, scan length, and effective dose between 70-kVp and 120-kVp CT scans
70 kVp (n = 20) 120 kVp (n = 20) P Value* CTDIvol(mGy) 7.27 ± 0.93 10.79 ± 0.86 <0.001 Scan length (cm) 18.32 ± 3.29 19.05 ± 1.88 0.74 DLP (mGy*cm) 144.23 ± 29.90 224.60 ± 35.15 <0.001 Eff dose (mSv) 0.85 ± 0.18 1.33 ± 0.21 <0.001 Note:—DLP is calculated by multiplying the CTDIvol by the scan length in the z-axis. Eff dose indicates effective radiation dose, calculated by multiplying the DLP by mSv*mGy-1*cm-1.11
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↵* P values comparing 70-kVp and 120-kVp scans.
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