Table 1 Patient and target motion characteristics (Patient number = 22; Treatment fractions = 92).

From: Target margin design for real-time lung tumor tracking stereotactic body radiation therapy using CyberKnife Xsight Lung Tracking System

Characteristics

Anatomical location:

Upper lobe

9

Middle lobe

7

Lower lobe

6

Tumor location

Peripheral

9

Central

13

Fractions: Mean ± SD

4.2 ± 2.1

Treatment time: Mean ± SD/median (minute)

28.6 ± 7.4/26.0

Tumor density: Mean ± SD/median (g/cm3)

0.88 ± 0.08/0.85

Tumor volume: Mean ± SD/median (cm3)

12.7 ± 7.8/7.5

Tumor size (the longest lengths in three dimensions): Mean (cm)

3.0 * 2.2 * 2.0

Tumor motion range*: Mean ± SD (mm)

S-I direction

9.0 ± 7.3

L-R direction

8.5 ± 5.6

A-P direction

4.8 ± 3.5

  1. *Tumor range is the 1–99% range of target positions in each direction obtained from each treatment fraction.
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