Research Article
Fan-Shaped Complete Block on Helical Tomotherapy for Esophageal Cancer: A Phantom Study
Table 1
Quantitative dose indices for lungs, spinal cord, heart, and tumor for treatment plan of nonblock and various FSCB designs.
| | Nonblock | FSCB 90° | FSCB 100° | FSCB 110° | FSCB 120° | FSCB 130° | FSCB 140° |
| Lungs | | | | | | | | MLD (Gy) | 14.53 ± 0.94 | 9.38 ± 0.26 | 9.06 ± 0.11 | 8.73 ± 0.09 | 8.12 ± 0.04 | 7.33 ± 0.32 | 7.05 ± 0.04 | (%) | 18.04 ± 0.91 | 11.76 ± 1.46 | 11.42 ± 0.47 | 10.70 ± 0.99 | 10.57 ± 0.80 | 10.28 ± 1.02 | 9.38 ± 0.13 | (%) | 36.84 ± 0.22 | 21.11 ± 2.03 | 20.10 ± 0.77 | 18.85 ± 0.30 | 17.27 ± 0.37 | 14.49 ± 1.86 | 14.13 ± 0.27 | (%) | 77.19 ± 4.72 | 34.34 ± 1.03 | 32.24 ± 0.16 | 30.31 ± 3.71 | 28.14 ± 1.48 | 21.10 ± 2.40 | 20.68 ± 0.26 | (%) | 97.03 ± 0.12 | 54.07 ± 0.63 | 52.41 ± 0.80 | 46.74 ± 1.35 | 41.50 ± 0.68 | 33.41 ± 1.32 | 30.79 ± 0.19 |
| Spinal cord | | | | | | | | maximum dose (Gy) | 33.57 ± 0.57 | 41.64 ± 0.79 | 41.87 ± 0.64 | 42.86 ± 0.45 | 43.41 ± 0.15 | 44.02 ± 0.14 | 44.45 ± 0.10 | Heart | | | | | | | | mean dose (Gy) | 20.93 ± 0.50 | 29.15 ± 0.83 | 29.27 ± 0.36 | 31.03 ± 0.41 | 31.50 ± 1.11 | 32.11 ± 0.94 | 32.41 ± 0.37 | (%) | 6.72 ± 0.03 | 13.97 ± 1.22 | 15.07 ± 0.94 | 17.60 ± 0.44 | 19.02 ± 3.77 | 23.26 ± 1.59 | 25.78 ± 0.50 |
| PTV | | | | | | | | CN | 0.91 ± 0.00 | 0.82 ± 0.02 | 0.82 ± 0.01 | 0.82 ± 0.00 | 0.77 ± 0.02 | 0.75 ± 0.03 | 0.71 ± 0.01 | HI | 1.02 ± 0.00 | 1.04 ± 0.00 | 1.04 ± 0.00 | 1.06 ± 0.00 | 1.07 ± 0.00 | 1.07 ± 0.01 | 1.07 ± 0.00 |
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