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The rationale for MR-only delineation and planning: retrospective CT–MR registration and target volume analysis for prostate radiotherapy. JOURNAL OF RADIOTHERAPY IN PRACTICE 2021. [DOI: 10.1017/s1460396920000230] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
AbstractAim:Magnetic resonance imaging (MRI) is indispensable for treatment planning in prostate radiotherapy (PR). Registration of MRI when compared to planning CT (pCT) is prone to uncertainty and this is rarely reported. In this study, we have compared three different types of registration methods to justify the direct use of MRI in PR.Methods and materials:Thirty patients treated for PR were retrospectively selected for this study and all underwent both CT and MRI. The MR scans were registered to the pCT using markers, focused and unfocussed methods and their registration are REGM, REGF, and REGNF, respectively. Registration comparison is done using the translational differences of three axes from the centre-of-mass values of gross tumour volume (GTV) generated using MRI.Results:The average difference in all three axes (x, y, z) is (1, 2·5, 2·3 mm) and (1, 3, 2·3 mm) for REGF-REFNF and REGF-REGM, respectively. MR-based GTV Volume is less in comparison to CT-based GTV and it is significantly different (p < 0·001).Findings:Image registration uncertainty is unavoidable for a regular CT–MR workflow. Additional planning target volume margin ranging from 2 to 3mm could be avoided if MR-only workflow is employed. This reduction in the margin is beneficial for small tumours treated with hypofractionation.
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[PET technology: Latest advances and potential impact on radiotherapy]. Cancer Radiother 2020; 24:628-634. [PMID: 32861609 DOI: 10.1016/j.canrad.2020.07.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Revised: 07/17/2020] [Accepted: 07/21/2020] [Indexed: 01/08/2023]
Abstract
Multimodal imaging has become a standard for planning radiation therapy via magnetic resonance imaging (MRI) or positron emission tomography (PET) in many cancers. However, its use is now old, and its impact has not been much discussed in light of technological improvements in imaging and advances in radiotherapy. However, in 20 years, the exclusive functional imaging has been replaced by hybrid imaging (functional and anatomical) with successive improvements (flight time, detector modifications, digitisation, etc.) have enabled us to go from centimetric resolution to the current 3 to 4mm resolution. This article will specifically review PET technology, its latest advances and the potential impact on radiotherapy, particularly head and neck cancers.
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Lock MI, Heinrichs A, Bhattacharya G, Cusano E, Ash R, D'Souza D, Rodrigues G, Dinniwell R, Venkatesan V, Bauman G, Wong E. The Utility of Penile Bulb Contouring to Localise the Prostate Apex as Compared to Urethrography. J Med Imaging Radiat Sci 2018; 49:76-83. [PMID: 30479293 DOI: 10.1016/j.jmir.2017.10.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2016] [Revised: 10/01/2017] [Accepted: 10/02/2017] [Indexed: 10/18/2022]
Abstract
PURPOSE High-precision radiotherapy relies on accurate anatomic localisation. Urethrography is often used to localise the prostatic apex. However, urethrography is an invasive localisation procedure and may introduce a systemic error. The penile bulb (PB) is contoured to minimise the risk of erectile dysfunction. The purpose of this study is to assess the value of using the PB, as an alternative to urethrography, to localise the prostate. METHODS AND MATERIALS The PB was localised on 10 patients treated with simplified intensity-modulated arc radiotherapy at computed tomography simulation during treatment weeks 1 and 7. All patients underwent placement of fiducial markers. Urethrography was used only at simulation. Distances from the superior PB contour to the inferior prostate contour, the apex fiducial marker, and to the inferior prostate contour were obtained as well. The PB was contoured by two observers independently. Agreement coefficients and analysis of variance were used to assess reliability between rates and consistency of measurements over time. RESULTS The PB-apex distance was greater than or equal to the urethrogram-apex distance in 24/30 (80%) measurements, and the median difference was 3 mm and was consistent between raters. The greatest variation in PB-IM distance between weeks was 6 mm, the median was 3 mm, and the agreements of measurements between weeks for raters 1 and 2 were 0.79 and 0.69, respectively. These differences were not statistically different and were consistent with the computed tomography slice thickness. CONCLUSIONS The PB can be used to identify the prostate apex and can be reliably contoured between observers. Measurements are consistent between patients and through the duration of treatment. The PB distance measurements support studies indicating that urethrography causes a shift of the prostate superiorly. The distance from the PB to prostate apex remains stable during treatment for individual patients but varies between patients.
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Affiliation(s)
- Michael I Lock
- Division of Radiation Oncology, London Regional Cancer Program, London Health Sciences Centre, London, Ontario, Canada.
| | - Alicia Heinrichs
- Department of Physics and Astronomy, University of Western Ontario, London, Ontario, Canada
| | - Gaurav Bhattacharya
- Division of Radiation Oncology, University of Ottawa, Ottawa, Ontario, Canada.
| | - Ellen Cusano
- Faculty of Medicine, University of Ottawa, Ottawa, Ontario, Canada
| | - Robert Ash
- Valley Radiotherapy, St. Joseph Hospital Orange, California, USA
| | - David D'Souza
- Division of Radiation Oncology, London Regional Cancer Program, London Health Sciences Centre, London, Ontario, Canada
| | - George Rodrigues
- Division of Radiation Oncology, London Regional Cancer Program, London Health Sciences Centre, London, Ontario, Canada
| | - Robert Dinniwell
- Department of Radiation Oncology, University of Toronto, Toronto, Ontario, Canada
| | - Varagur Venkatesan
- Division of Radiation Oncology, London Regional Cancer Program, London Health Sciences Centre, London, Ontario, Canada
| | - Glenn Bauman
- Division of Radiation Oncology, London Regional Cancer Program, London Health Sciences Centre, London, Ontario, Canada
| | - Eugene Wong
- Division of Radiation Oncology, London Regional Cancer Program, London Health Sciences Centre, London, Ontario, Canada; Department of Physics and Astronomy, University of Western Ontario, London, Ontario, Canada
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Moreau J, Biau J, Achard JL, Toledano I, Benhaim C, Kwiatkowski F, Loos G, Lapeyre M. Intraprostatic Fiducials Compared with Bony Anatomy and Skin Marks for Image-Guided Radiation Therapy of Prostate Cancer. Cureus 2017; 9:e1769. [PMID: 29238628 PMCID: PMC5726731 DOI: 10.7759/cureus.1769] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Purpose Prostate motion occurs during radiotherapy for localized prostate cancer. We evaluated the input of intraprostatic fiducials for image-guided radiation therapy and compared it with bony anatomy and skin marks. Methods Eleven patients were implanted with three fiducial markers in the prostate. Daily sets of orthogonal kV-kV images were compared with digitally reconstructed radiography. Data were recorded for skin marks, bony anatomy, and fiducial markers. The variations were analyzed along three principal axes (left-right: LR, superoinferior: SI, and anteroposterior: AP). Results A total of 2,417 measures were recorded over 38 fractions of radiotherapy (76 Gy). Fiducial marker movements from bony anatomy were ≤ 5 mm for 84.2% (confidence interval: CI 95%±1.5), 91.3% (CI 95%±1.1), and 99.5% (CI 95%±0.4) of the measures along the AP, SI, and LR axes, respectively. Ninety-five percent of the shifts between a fiducial marker and the bony anatomy were < 8 mm in the AP and SI axes, and < 3 mm in the LR axis. Fiducial marker movements from skin marks were ≤ 5 mm for 64.8% (CI 95%±1.9), 79.2% (CI 95%±1.6), and 87.2% (CI 95%±1.3) of the measures along the AP, SI, and LR axes, respectively. Bony anatomy movements from skin marks were ≤ 5 mm for 84% (CI 95%±1.4), 92% (CI 95%±1.1), and 87% (CI 95%±1.3) of the measurements along the AP, SI, and LR axes, respectively. Conclusion Using fiducial markers provides better accuracy of repositioning of the prostate than using bony anatomy and skin marks for image-guided radiotherapy of prostate cancer.
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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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de Crevoisier R, Pommier P, Latorzeff I, Chapet O, Chauvet B, Hennequin C. Radiothérapie externe des cancers prostatiques. Cancer Radiother 2016; 20 Suppl:S200-9. [DOI: 10.1016/j.canrad.2016.07.037] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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Abstract
We reviewed the literature on the use of margins in radiotherapy of patients with prostate cancer, focusing on different options for image guidance (IG) and technical issues. The search in PubMed database was limited to include studies that involved external beam radiotherapy of the intact prostate. Post-prostatectomy studies, brachytherapy and particle therapy were excluded. Each article was characterized according to the IG strategy used: positioning on external marks using room lasers, bone anatomy and soft tissue match, usage of fiducial markers, electromagnetic tracking and adapted delivery. A lack of uniformity in margin selection among institutions was evident from the review. In general, introduction of pre- and in-treatment IG was associated with smaller planning target volume (PTV) margins, but there was a lack of definitive experimental/clinical studies providing robust information on selection of exact PTV values. In addition, there is a lack of comparative research regarding the cost-benefit ratio of the different strategies: insertion of fiducial markers or electromagnetic transponders facilitates prostate gland localization but at a price of invasive procedure; frequent pre-treatment imaging increases patient in-room time, dose and labour; online plan adaptation should improve radiation delivery accuracy but requires fast and precise computation. Finally, optimal protocols for quality assurance procedures need to be established.
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Affiliation(s)
- Slav Yartsev
- 1 London Regional Cancer Program, London Health Sciences Centre, London, ON, Canada.,2 Departments of Oncology and Medical Biophysics, Western University, London, ON, Canada
| | - Glenn Bauman
- 1 London Regional Cancer Program, London Health Sciences Centre, London, ON, Canada.,2 Departments of Oncology and Medical Biophysics, Western University, London, ON, Canada
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Bonnes pratiques de radiothérapie guidée par l’image. Cancer Radiother 2015; 19:489-500. [DOI: 10.1016/j.canrad.2015.06.013] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2015] [Accepted: 06/16/2015] [Indexed: 11/22/2022]
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Sbai A, Thariat J, Tachfouti N, Pan Q, Lagrange JL. [Intraprostatic calcifications as natural fiducial markers in image-guided radiotherapy for prostate cancer]. Cancer Radiother 2014; 18:740-4. [PMID: 25451671 DOI: 10.1016/j.canrad.2014.07.161] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2013] [Revised: 04/07/2014] [Accepted: 07/03/2014] [Indexed: 10/24/2022]
Abstract
PURPOSE To establish whether intraprostatic calcifications can serve as natural fiducials for image-guided radiotherapy (IGRT), replacing the implantation of intraprostatic fiducial markers. PATIENTS AND METHODS Patients with prostate cancer, having intraprostatic calcifications visible on CT scan were selected and underwent intensity-modulated radiotherapy/3D conformal radiotherapy with IGRT in the department of radiotherapy of Henri-Mondor Hospital. All cone-beam computed tomographies (CBCT) were repositioned on intraprostatic calcifications. For each acquired image, displacements of intraprostatic calcifications were calculated with reference to position on planning CT in three directions: lateral, longitudinal and vertical. RESULTS Between 2011 and 2013, nine patients had 183 CBCT. For each image, three displacements and space coordinates were calculated using a single reference (intraprostatic calcification). Mean lateral, longitudinal and vertical movements were 0.26±5.7 mm, -1±4.6 mm and 0.42±3.5 mm, respectively. CONCLUSION Studies exploring prostatic movements with fiducial markers as reference and ours with natural fiducials yield similar results. Our data confirm previous studies that have suggested that intraprostatic calcifications can be used as natural fiducials with potential reduction of iatrogenic risks and costs associated with the implantation of fiducial markers.
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Affiliation(s)
- A Sbai
- Centre régional d'oncologie Hassan-II, BP 2013, oued Nachef, Oujda, Maroc.
| | - J Thariat
- Département de radiothérapie, centre Antoine-Lacassagne, 33, avenue Valombrose, 06189 Nice cedex 2, France; Université Nice-Sophia-Antipolis, 33, avenue Valombrose, 06189 Nice cedex 2, France
| | - N Tachfouti
- Laboratoire d'épidémiologie, recherche clinique et de santé communautaire, CHU Hassan-II, Fès, Maroc
| | - Q Pan
- Service de radiothérapie, hôpital Henri-Mondor, 51, avenue du Maréchal-de-Lattre-de-Tassigny, 94010 Créteil cedex, France
| | - J-L Lagrange
- Service de radiothérapie, hôpital Henri-Mondor, 51, avenue du Maréchal-de-Lattre-de-Tassigny, 94010 Créteil cedex, France; Université Paris Est Créteil, avenue du Général-de-Gaulle, 94010 Créteil cedex, France
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