Prostate shifts in the longitudinal direction. (a) Daily prostate shifts for all fractions. (b) The means and standard deviations of patient specific shifts. Positive and negative shifts correspond to the prostate shifts in the inferior and superior directions, respectively.
Daily D99 of (a) the prostate and (b) pelvic lymph nodes. D99 is expressed as a ratio of the daily dose to the planned dose.
Average volume of (a) the prostate and (b) pelvic lymph nodes receiving the prescription dose for each patient. Error bar indicates one standard deviation.
Typical DVHs of the targets and OARs for one fraction of a patient. P for prostate, PLN for pelvic lymph nodes, B for bladder, and R for rectum.
Daily D5 of the (a) bladder and (b) rectum. D5 is expressed as a ratio of the daily dose to the planned dose.
Mean dose of the (a) bladder and (b) rectum as a ratio of the daily dose to the planned dose. Error bar represents one standard deviation.
Isodose line differences and absolute dose differences between the measured and calculated planar doses for the original and shifted plans corresponding to prostate movements of 2, 4, and 8 mm in the longitudinal direction for the Novalis TX machine.
Dose metrics, including (a) isodose line differences, (b) absolute dose differences (3%), (c) DTA (3 mm), and (d) gamma index (3%/3 mm) between measurements and calculations of the original IMRT plans from (A) 2.5 mm MLC and (B) 10 mm MLC. Areas in bright color indicate points in the planar dose that fail the criterion of each dose metric.
Characteristics of three MLCs used in this study.
The dosimetric comparison of D99 and D mean of the prostate and pelvic lymph nodes for 2.5, 5, and 10 mm MLC shifted plans.
The average volumes of the prostate and pelvic lymph nodes receiving the prescription dose for each patient.
Gamma passing rate (3%/3 mm) between the measured and calculated plans for the original IMRT plans and MLC shifted plans corresponding to prostate movements of 2, 4, and 8 mm in the longitudinal direction.
The percentages of pixels with dose differences between the measurement and calculation being less than 3% and 5% of the maximum dose.
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