Cine-Magnetic Resonance Imaging Assessment of Intrafraction Motion for Prostate Cancer Patients Supine or Prone With and Without a Rectal Balloon
| Autor: | Qingguo Zengm, Aaron D. Falchook, Jim Dempsey, Daniel J. Indelicato, Sameer R. Keole, Anneyuko I. Saito, Wen Chien Hsi, Kenneth Oliver, Carlos Vargas |
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| Rok vydání: | 2010 |
| Předmět: |
Male
Cancer Research medicine.medical_specialty Supine position Magnetic Resonance Imaging Cine Rectum Catheterization Motion Prostate cancer Prostate Prone Position Supine Position Humans Medicine Radiation Injuries medicine.diagnostic_test business.industry Prostatic Neoplasms Magnetic resonance imaging medicine.disease Prone position medicine.anatomical_structure Oncology Intrafraction motion Radiology Rectal Balloon business |
| Zdroj: | American Journal of Clinical Oncology. 33:11-16 |
| ISSN: | 0277-3732 |
| Popis: | Purpose: Determine prostate intrafraction motion with Cine-magnetic resonance imaging (MRI) and deformable registration. Methods: A total of 68 cine-MRI studies were done in 17 different series with 4 scans per series in 7 patients. In without rectal balloon (WORB) scans, 100 mL of water was infused in the rectum. Each series consisted of supine and prone, with a rectal balloon (WRB) and WORB. Each scan was performed over 4 minutes. Automatic deformable registration software developed by View Ray, Inc., Cleveland, Ohio was employed to segment the prostate for each cine-MRI image. A time-based analysis was done for the different positions and the use of the rectal balloon. Results: The variation/standard deviation of the prostate position during 240 seconds was: supine WRB: 0.55 mm, WORB: 1.2 mm, and prone WRB: 1.48 mm, WORB: 2.15 mm (P < 0.001). A strong relationship was observed between time and prostate motion. For the initial 120 s the standard deviation was smaller than for the second 120 s supine WRB 0.54 mm versus 1.37 mm; supine WORB 0.61 mm versus 1.70 mm; prone WRB 0.85 mm versus 1.85 mm; and prone WORB 1.60 mm versus 2.56 mm. The probabilities for prostate staying within ±2 mm to its initial position are: 94.8% supine WRB; 91.5% supine WORB; 92.3% prone WRB; 79.2% prone WORB. Conclusions: Intrafraction prostate motion was found dependent on time, patient position, and the use of a rectal balloon. Relatively stable positions can be obtained for 4 minutes or less especially in the supine position with a rectal balloon. |
| Databáze: | OpenAIRE |
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