Prostate gland motion assessed with cine-magnetic resonance imaging (cine-MRI)

Ghilezan, M.; Jaffray, David A.; Siewerdsen, Jeffrey H.; Herk, Marcel van; Shetty, Anil N.; Sharpe, Michael B.; Jafri, Syed; Vicini, Frank A.; Matter, Richard C.; Brabbins, D.; Martínez, Álvaro

doi:10.1016/j.ijrobp.2003.10.017

Cited by 317 publications

(236 citation statements)

References 30 publications

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“…An empty rectum has been correlated with less intrafraction prostate movement in studies using cine MRI (33). Ghilzean et al (25)imaged six patients on 3 days also using cine MRI over a time period of 20mins. The time frame for a 10% probability of moving >3mm increased from ~1min in the case of a full rectum to 20 min in the case of a empty rectum.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

A Comparison of the Use of Bony Anatomy and Internal Markers for Offline Verification and an Evaluation of the Potential Benefit of Online and Offline Verification Protocols for Prostate Radiotherapy

McNair

Hansen

Parker

et al. 2008

International Journal of Radiation Oncology*Biology*Physics

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Section: Discussionmentioning

confidence: 99%

“…Intrafraction motion has been much less investigated than interfraction motion. A summary of intra fraction motion studies can be found in Ghilezan et al (25). Intrafraction motion has been assessed by:-…”

Section: Introductionmentioning

confidence: 99%

A Comparison of the Use of Bony Anatomy and Internal Markers for Offline Verification and an Evaluation of the Potential Benefit of Online and Offline Verification Protocols for Prostate Radiotherapy

McNair

Hansen

Parker

et al. 2008

International Journal of Radiation Oncology*Biology*Physics

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“…1. Finally, Ghilezan et al ( 22 ) during a one‐hour MRI session acquired images of the prostate observing displacements for 11 points of interest. The calculation of the displacement probability showed an increase of this probability with time for all the points observed and the higher the displacement magnitude, the steeper was the increase.…”

Section: Discussionmentioning

confidence: 99%

Cone beam CT pre‐ and post‐daily treatment for assessing geometrical and dosimetric intrafraction variability during radiotherapy of prostate cancer

Reggiori

Mancosu

Tozzi

et al. 2010

J Applied Clin Med Phys

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The purpose of this study was to quantify the relationship between treatment time and dose uncertainty due to intrafraction organ motion in prostate cancer radiotherapy (RT). Ten consecutive patients with prostate cancer treated by radical RT by volumetric modulated arc therapy (RapidArc) were considered. For each patient, pre‐ and post‐treatment cone beam computed tomography (CBCT) was performed in 10 fractions. The prostate, rectum and bladder were contoured on each CBCT. The change in organ position, volume and dosimetric uncertainty induced by organ motion were evaluated. Interval time between the two CBCTs ranged between 4 and 16 min (mean 7.3±0.7 min). Treatment with intrafraction prostate motion > 3 mm and > 5 mm were 24% and 5%, respectively. Regarding change in centroid position and volume, a poor time correlation was found for target and rectum, while a constant increase was obtained for bladder. The agreement index was highly correlated to time (normalr=−0.89 for bladder, normalr=−0.95 for rectum, and normalr=−0.84 for prostate). In terms of difference in dose volume histogram between pre‐ and post‐CBCT, the dose uncertainties for the targets and rectum amplified with the increasing time. The increasing intrafraction dose uncertainty with time requires the use of an RT technique with minimization of treatment time to improve confidence in planning dose distribution.PACS number: 87.55.tm

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“…They found that the position of the prostate was not related to the position of the pelvic bones. Ghilezan et al [2] found that the degree of prostate motion depended on the volume of feces in the rectum. In other words, the prostate moves independently in the body, and its motion depends on the rectal volume.…”

Section: Introductionmentioning

confidence: 99%

“…Ghilezan et al [2] found that prostate motion would be produced by the deformation of the rectum; this means that the impact of rectum deformation on the dose distribution could include the impact of prostate motion. It is important to evaluate the impact of each of the factors.…”

Section: Introductionmentioning

confidence: 99%

Impact of pitch angle setup error and setup error correction on dose distribution in volumetric modulated arc therapy for prostate cancer

Takemura

Togawa

Yokoi

et al. 2016

Radiol Phys Technol

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In volumetric modulated arc therapy (VMAT) for prostate cancer, a positional and rotational error correction is performed according to the position and angle of the prostate. The correction often involves body leaning, and there is concern regarding variation in the dose distribution. Our purpose in this study was to evaluate the impact of body pitch rotation on the dose distribution regarding VMAT. Treatment plans were obtained retrospectively from eight patients with prostate cancer. The body in the computed tomography images for the original VMAT plan was shifted to create VMAT plans with virtual pitch angle errors of ±1.5 and ±3 degrees. Dose distributions for the tilted plans were recalculated with use of the same beam arrangement as that used for the original VMAT plan. The mean value of the maximum dose differences in the dose distributions between the original VMAT plan and the tilted plans was 2.98 ± 0.96%. The value of the homogeneity index for the planning target volume (PTV) had an increasing trend according to the pitch angle error, and the values of the D 95 for the PTV and D 2ml , V 50 , V 60 and V 70 for the rectum had decreasing trends (p<0.05). However, there was no correlation between differences in these indexes and the maximum dose difference. The pitch angle error caused by body leaning had little effect on the dose distribution, in contrast, the pitch angle correction reduced the effects of organ displacement and improved these indexes. Thus, the pitch angle setup error in VMAT for prostate cancer should be corrected. Keywordsvolumetric modulated arc therapy, prostate cancer, setup error, dose distribution, pitch angle 4

show abstract

Prostate gland motion assessed with cine-magnetic resonance imaging (cine-MRI)

Cited by 317 publications

References 30 publications

A Comparison of the Use of Bony Anatomy and Internal Markers for Offline Verification and an Evaluation of the Potential Benefit of Online and Offline Verification Protocols for Prostate Radiotherapy

A Comparison of the Use of Bony Anatomy and Internal Markers for Offline Verification and an Evaluation of the Potential Benefit of Online and Offline Verification Protocols for Prostate Radiotherapy

Cone beam CT pre‐ and post‐daily treatment for assessing geometrical and dosimetric intrafraction variability during radiotherapy of prostate cancer

Impact of pitch angle setup error and setup error correction on dose distribution in volumetric modulated arc therapy for prostate cancer

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