(Non)-migration of radiopaque markers used for on-line localization of the prostate with an electronic portal imaging device

Pouliot, Jean; Aubin, Michèle; Langen, K; Liu, Yuming; Pickett, Barby; Shinohara, Katsuto; Roach, Mack

doi:10.1016/s0360-3016(03)00267-0

Cited by 146 publications

(111 citation statements)

References 12 publications

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“…They reported a mean migration of 0.8±0.3 mm which was less than the mean migration (1.2±0.6 mm) found by Delouya et al [9] in patients treated without ADT. This result was also discordant with the findings of Pouliot et al [15] concerning 11 patients 8 of which received concurrent ADT. Three of these 8 patients showed a reduction in intermarker distance of approximately 6 mm within 52 days due to a global reduction in prostate volume.…”

Section: Discussionsupporting

confidence: 85%

Computed tomography based evaluation of prostatic fiducial marker migration between the periods of insertion and simulation

Arpaci

Uğurluer

Ispir

et al. 2017

Turkish Journal of Urology

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Objective: The aim of this study was to determine whether significant fiducial marker migration occurs between the periods of prostatic marker insertion and computed tomography (CT) performed for radiotherapy planning and if a waiting period is necessary. Material and methods:Thirty-nine patients with prostate adenocarcinoma underwent fiducial marker insertion before radiotherapy between June 2013 and December 2015. Three markers were inserted by one radiologist under the guidance of transrectal ultrasonography. All patients underwent CT three hours after insertion to confirm the number and position of fiducial markers. Radiotherapy planning CT was performed on an average of 11 days (range 7-20) after insertion. CT images were imported into treatment planning system to analyze the position of fiducial markers. Point-based marker match algorithm was used to find the distance of marker migration. The mean and maximum distances between each fiducial markers were calculated. Results:The mean distance of migration was 1.029±0.42 mm (range 0.23-1.93 mm) and the maximum distance was 1.361±0.59 mm (range 0.25-2.74 mm). The distance of marker migration was not statistically significant for the groups organized according to the timing of marker insertion, prostate volume, patient age, prostate specific antigen level and Gleason score. Conclusion:According to our results significant fiducial marker migration did not occur during the interval between insertion and treatment planning CT. It should be taken into consideration that performing simulation on the same day as marker insertion might prevent increased cost and delayed radiation therapy by saving the patients from extra visits to the clinic.

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Section: Discussionsupporting

confidence: 85%

Computed tomography based evaluation of prostatic fiducial marker migration between the periods of insertion and simulation

Arpaci

Uğurluer

Ispir

et al. 2017

Turkish Journal of Urology

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“…Other authors have shown that the use of gold markers is clinically feasible (18,11,19), that there is no significant marker migration within the prostate (20,21,22) and that there is independent prostate movement (23,24)relative to bony anatomy. The consequence of using bony anatomy for prostate position verification instead of gold markers using an off-line protocol has also been shown [29,24].…”

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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“…Co-based RT platforms are still commonly used in the developing world, LINAC-based approaches have largely supplanted 60 Co platforms in the United States and Europe [50]. This is largely due to the superior dosimetric capabilities afforded by LINACs.…”

Section: Introductionmentioning

confidence: 99%

“…This is largely due to the superior dosimetric capabilities afforded by LINACs. 60 Co-based devices due to its lower energy spectrum typically generate beams that have less penetration and broader penumbrae, creating an inferior dose distribution. When utilized in conjunction with modern technological advances involved in IMRT (e.g., multi-leaf collimators and inverse planning software), 60 Co-based devices may be able to deliver dosimetrically comparable plans.…”

Section: Introductionmentioning

confidence: 99%

“…60 Co-based devices due to its lower energy spectrum typically generate beams that have less penetration and broader penumbrae, creating an inferior dose distribution. When utilized in conjunction with modern technological advances involved in IMRT (e.g., multi-leaf collimators and inverse planning software), 60 Co-based devices may be able to deliver dosimetrically comparable plans. As mentioned, the tri- 60 Co system includes three 60 Co sources mounted 120º from each other on a rotating gantry ( Figure 1).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

MRI-guided radiotherapy: Opening our eyes to the future

Kishan¹,

Lee²

2016

Integr Cancer Sci Therap

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When discussing local treatment modalities, physicians often quip that there can be no blind surgeons, suggesting that an inherent advantage to surgery is the ability to precisely visualize the target. Advances in radiation therapy (RT) technology over the years have significantly improved the radiation oncologists' abilities to precisely sculpt high-dose radiation to a variety of targets, simultaneously improving local control and toxicity profiles. However, even the most sophisticated methods of CT-based image-guided radiotherapy (IGRT) are hampered by limitations that can compromise target localization and motion management. Additionally, realtime adaptive radiotherapy (ART) programs, wherein radiation plans can be molded to fit the often malleable anatomy of tumors and organs-at-risk, have not yet been developed. For these reasons, MRI-guided RT is considered the next frontier of radiation oncology. However, the development of integrated MRI/RT-delivery platforms is complicated by several technical challenges that have precluded development of MRI-guided linear accelerators. By virtue of employing a low-field (0.35 T) MRI and three 60 Co sources, a newly available tri-60 Co teletherapy system (MRIdian System™, ViewRay™, Cleveland, OH, USA) has tackled these technical concerns and has thus become the first MRI-guided RT platform with FDA approval for medical use. In this Review, we describe the abilities of this device to accomplish the goals of MRI-guided RT-improved target localization, sophisticated motion management, and on-line ART-by exploring published feasibility, proof-of-principle, and proof-of-practice studies.

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(Non)-migration of radiopaque markers used for on-line localization of the prostate with an electronic portal imaging device

Cited by 146 publications

References 12 publications

Computed tomography based evaluation of prostatic fiducial marker migration between the periods of insertion and simulation

Computed tomography based evaluation of prostatic fiducial marker migration between the periods of insertion and simulation

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

MRI-guided radiotherapy: Opening our eyes to the future

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