Clinical Experience with the Calypso® 4D Localization System in Prostate Cancer Patients: Implantation, Tolerance, Migration, Localization and Real Time Tracking

Four dimensional (4D) target localization system (Calypso System) was installed at our hospital, which is equipped with Beacon Transponders, Console, Electromagnetic Array, Optical System, Tracking Station, Treatment table overlay, and Calypso kVue Couch top. The objective of this presentation is to describe the results of commissioning measurements carried out on the Calypso System to verify the manufacturer specifications and also to evolve a quality assurance (QA) procedure which can be used to test its performance routinely. The QA program consists of a series of tests (QA for checking the calibration or system accuracy, Camera Calibration with L-frame fixture, Camera Calibration with T-frame fixture, System calibration Fixture targets test, Localization, and Tracking). These tests were found to be useful to assess the performance of the Calypso System.

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“…Studies of this electromagnetic tracking system proved sub-millimeter position measurement accuracy during real-time tracking. [1234]…”

Section: Introductionmentioning

confidence: 99%

Commissioning and quality assurance of Calypso four-dimensional target localization system in linear accelerator facility

et al. 2013

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“…The Calypso Localization system is one of the most prevalent methods which is widely used for tumor positioning in prostate radiation therapy [6], [7], [8], [3]. In the Calypso system, three magnetic transponders are implanted in or near the target.…”

Section: Introductionmentioning

confidence: 99%

“…Localization of the transponders is achieved using an electromagnetic array consisting of four electromagnetic coils to excite the transponders and 32 receiving coils to pick up the response signal coming from the transponders. The positions of the implanted transponders are calculated relative to the magnetic array based on the response measurements [6], [3]. There are several other electromagnetic tracking systems (such as in [2], [13]) that use a similar idea to track the tumor position during the radiation therapy.…”

Section: Introductionmentioning

confidence: 99%

A novel method for tumor localization and tracking in radiation therapy

Pourhomayoun

Fowler

Jin

2012

2012 Conference Record of the Forty Sixth Asilomar Conference on Signals, Systems and Computers (ASILOMAR)

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Abstract-Because the position of a tumor changes during radiation therapy (because of respiration or patient movements), real-time tumor tracking is necessary during radiation therapy in order to deliver a sufficient dose of radiation to the tumor without damaging the surrounding healthy tissues. In this paper, we propose a novel tumor positioning method based on spatial sparsity. We estimate the position by processing the received signals from only one implantable RF transmitter. The method is easier to implement, non-iterative, faster and more accurate compared to common magnetic transponder based methods. We evaluate the performance of the proposed method using MonteCarlo simulation.

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“…The Calypso Localization system is one of the most prevalent methods that has been widely used for tumor positioning in prostate radiation therapy [7], [4]. In the Calypso system, three magnetic transponders are implanted in or near the target.…”

Section: Introductionmentioning

confidence: 99%

“…Localization of the transponders is achieved using an electromagnetic array consisting of four electromagnetic coils to excite the transponders and 32 receiving coils picking up the response signal coming from the transponders. The positions of implanted transponders are calculated relative to the magnetic array based on the response measurements [7], [4]. There are several other electromagnetic tracking systems such as the methods proposed in [2], [12] that use the similar idea to track the tumor positions during the radiation therapy.…”

Section: Introductionmentioning

confidence: 99%

Robustness analysis of sparsity based tumor localization under tissue configuration uncertainty

Pourhomayoun¹,

Fowler²,

Jin³

2012

2012 IEEE Signal Processing in Medicine and Biology Symposium (SPMB)

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Knowing the exact position of the tumor is a very critical prerequisite in radiation therapy. Since the position of the tumor changes because of respiration or patient movements, a real-time tumor tracking method must be applied during the process of radiation therapy in order to deliver a sufficient dose of radiation to the tumor region without damaging the surrounding healthy tissues.In this paper, we develop a novel tumor positioning method based on spatial sparsity and then we investigate the sensitivity of this method to the uncertainty of tissue configuration. The proposed method is easier to implement, non-iterative, faster and more accurate compared to common magnetic transponder based approaches. The performance of the proposed method is evaluated in two different cases: (1) when the tissue configuration is perfectly determined (acquired beforehand by MRI or CT) and (2) when there are some uncertainties about the tissue boundaries. The results demonstrate the satisfactory accuracy and high performance of the proposed method, even when the tissue boundaries are imperfectly known.

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Clinical Experience with the Calypso® 4D Localization System in Prostate Cancer Patients: Implantation, Tolerance, Migration, Localization and Real Time Tracking

Cited by 12 publications

References 0 publications

Commissioning and quality assurance of Calypso four-dimensional target localization system in linear accelerator facility

Commissioning and quality assurance of Calypso four-dimensional target localization system in linear accelerator facility

A novel method for tumor localization and tracking in radiation therapy

Robustness analysis of sparsity based tumor localization under tissue configuration uncertainty

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