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Ramiandrisoa F, Duvergé L, Castelli J, Nguyen TD, Servagi-Vernat S, de Crevoisier R. [Clinical to planning target volume margins in prostate cancer radiotherapy]. Cancer Radiother 2016; 20:629-39. [PMID: 27614515 DOI: 10.1016/j.canrad.2016.07.095] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2016] [Revised: 07/22/2016] [Accepted: 07/27/2016] [Indexed: 02/03/2023]
Abstract
The knowledge of inter- and intrafraction motion and deformations of the intrapelvic target volumes (prostate, seminal vesicles, prostatectomy bed and lymph nodes) as well as the main organs at risk (bladder and rectum) allow to define rational clinical to planning target volume margins, depending on the different radiotherapy techniques and their uncertainties. In case of image-guided radiotherapy, prostate margins and seminal vesicles margins can be between 5 and 10mm. The margins around the prostatectomy bed vary from 10 to 15mm and those around the lymph node clinical target volume between 7 and 10mm. Stereotactic body radiotherapy allows lower margins, which are 3 to 5mm around the prostate. Image-guided and stereotactic body radiotherapy with adequate margins allow finally moderate or extreme hypofractionation.
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Affiliation(s)
- F Ramiandrisoa
- Département de radiothérapie, institut Jean-Godinot, 1, rue du Général-Kœnig, 51100 Reims, France.
| | - L Duvergé
- Département de radiothérapie, centre Eugène-Marquis, avenue de la Bataille-Flandres-Dunkerque, 35000 Rennes, France
| | - J Castelli
- Département de radiothérapie, centre Eugène-Marquis, avenue de la Bataille-Flandres-Dunkerque, 35000 Rennes, France; LTSI, campus de Beaulieu, université de Rennes 1, 35000 Rennes, France; Inserm U1099, campus de Beaulieu, 35000 Rennes, France
| | - T D Nguyen
- Département de radiothérapie, institut Jean-Godinot, 1, rue du Général-Kœnig, 51100 Reims, France
| | - S Servagi-Vernat
- Département de radiothérapie, institut Jean-Godinot, 1, rue du Général-Kœnig, 51100 Reims, France
| | - R de Crevoisier
- Département de radiothérapie, centre Eugène-Marquis, avenue de la Bataille-Flandres-Dunkerque, 35000 Rennes, France; LTSI, campus de Beaulieu, université de Rennes 1, 35000 Rennes, France; Inserm U1099, campus de Beaulieu, 35000 Rennes, France
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Calculation of planning margins for different verification techniques in radical prostate radiotherapy. JOURNAL OF RADIOTHERAPY IN PRACTICE 2014. [DOI: 10.1017/s1460396913000101] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
AbstractPurposeTo calculate and compare planning target volume (PTV) margins for an offline 3 mm tolerance, daily bony anatomy verification, tattoo alignment and online prostate marker matching with those currently used at our institution.MethodsSeventy patients had offline bony anatomy megavoltage verification. 23 different patients underwent fiducial marker matching using daily online kilovoltage verification. Systematic and random errors were measured in the right–left (RL), superior–inferior (SI) and anterior–posterior (AP) directions. Geometric uncertainties from literature were used to help calculate the margins.ResultsPTV margins (mm) were 7 RL, 12 SI and AP (3 mm tolerance offline bony), 6 RL, 11 SI and AP (daily online bony), 8 RL, 12 SI and AP (tattoo alignment) and 5 RL, 8 SI and 6 AP (online daily prostate marker correction).ConclusionsOur current margins for conformal radiotherapy patients are too small for phase 2 in the SI and AP directions. Implementing online daily bony anatomy matching would not reduce the PTV margin significantly. Online daily marker correction showed current PTV71 Gy margins as excessive by (mm) 5 RL, 2 SI and 4 anterior.
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