An investigation of the effects from a urethral warming system on temperature distributions during cryoablation treatment of the prostate: A phantom study

Favazza, Christopher P.; Gorny, Krzysztof R.; King, David M.; Rossman, Phillip J.; Felmlee, Joel P.; Woodrum, David A.; Mynderse, Lance A.

doi:10.1016/j.cryobiol.2014.06.004

Cited by 23 publications

(7 citation statements)

References 19 publications

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“…Fluoroptic sensors were initially employed in 2007 by Bouley et al, who investigated cryoablation outcomes on the in vivo dog prostate, and compared the effect with thermal damage induced by HIFU [ 36 ]. Recently, Favazza et al employed temperature data provided by fluoroptic sensors to assess the impact of a urethral warmer on temperature distributions around cryoneedles during cryoablation, in a tissue mimicking phantom [ 98 ].…”

Section: Application Of Foss In Temperature Monitoring During Thermentioning

confidence: 99%

Fiber Optic Sensors for Temperature Monitoring during Thermal Treatments: An Overview

Schena

Tosi

Saccomandi

et al. 2016

Sensors

183

108

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During recent decades, minimally invasive thermal treatments (i.e., Radiofrequency ablation, Laser ablation, Microwave ablation, High Intensity Focused Ultrasound ablation, and Cryo-ablation) have gained widespread recognition in the field of tumor removal. These techniques induce a localized temperature increase or decrease to remove the tumor while the surrounding healthy tissue remains intact. An accurate measurement of tissue temperature may be particularly beneficial to improve treatment outcomes, because it can be used as a clear end-point to achieve complete tumor ablation and minimize recurrence. Among the several thermometric techniques used in this field, fiber optic sensors (FOSs) have several attractive features: high flexibility and small size of both sensor and cabling, allowing insertion of FOSs within deep-seated tissue; metrological characteristics, such as accuracy (better than 1 °C), sensitivity (e.g., 10 pm·°C−1 for Fiber Bragg Gratings), and frequency response (hundreds of kHz), are adequate for this application; immunity to electromagnetic interference allows the use of FOSs during Magnetic Resonance- or Computed Tomography-guided thermal procedures. In this review the current status of the most used FOSs for temperature monitoring during thermal procedure (e.g., fiber Bragg Grating sensors; fluoroptic sensors) is presented, with emphasis placed on their working principles and metrological characteristics. The essential physics of the common ablation techniques are included to explain the advantages of using FOSs during these procedures.

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Section: Application Of Foss In Temperature Monitoring During Thermentioning

confidence: 99%

Fiber Optic Sensors for Temperature Monitoring during Thermal Treatments: An Overview

Schena

Tosi

Saccomandi

et al. 2016

Sensors

183

108

View full text Add to dashboard Cite

show abstract

“…131 Complicating factors to this assumption include heat transfer from adjacent major vessels or urethral warmers. 132 Studies have shown that ultra-short echo times can be used to visualize temperature changes within the iceball; however, this technique is yet to be widely applied clinically. [133][134][135] Confounding the need for good margin coverage is the problem of very restrictive space in and around the prostate bed with close proximity to the rectum, bladder, and external striated urethral sphincter.…”

Section: Limitations To Mri Visualization Of Iceball Temperature Isotmentioning

confidence: 99%

Magnetic Resonance–Guided Prostate Ablation

Woodrum

Kawashima

Gorny

et al. 2019

Semin intervent Radiol

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In 2019, the American Cancer Society (ACS) estimates that 174,650 new cases of prostate cancer will be diagnosed and 31,620 will die due to the prostate cancer in the United States. Prostate cancer is often managed with aggressive curative intent standard therapies including radiotherapy or surgery. Regardless of how expertly done, these standard therapies often bring significant risk and morbidity to the patient's quality of life with potential impact on sexual, urinary, and bowel functions. Additionally, improved screening programs, using prostatic-specific antigen and transrectal ultrasound-guided systematic biopsy, have identified increasing numbers of low-risk, low-grade “localized” prostate cancer. The potential, localized, and indolent nature of many prostate cancers presents a difficult decision of when to intervene, especially within the context of the possible comorbidities of aggressive standard treatments. Active surveillance has been increasingly instituted to balance cancer control versus treatment side effects; however, many patients are not comfortable with this option. Although active debate continues on the suitability of either focal or regional therapy for the low- or intermediate-risk prostate cancer patients, no large consensus has been achieved on the adequate management approach. Some of the largest unresolved issues are prostate cancer multifocality, limitations of current biopsy strategies, suboptimal staging by accepted imaging modalities, less than robust prediction models for indolent prostate cancers, and safety and efficiency of the established curative therapies following focal therapy for prostate cancer. In spite of these restrictions, focal therapy continues to confront the current paradigm of therapy for low- and even intermediate-risk disease. It has been proposed that early detection and proper characterization may play a role in preventing the development of metastatic disease. There is level-1 evidence supporting detection and subsequent aggressive treatment of intermediate- and high-risk prostate cancer. Therefore, accurate assessment of cancer risk (i.e., grade and stage) using imaging and targeted biopsy is critical. Advances in prostate imaging with MRI and PET are changing the workup for these patients, and advances in MR-guided biopsy and therapy are propelling prostate treatment solutions forward faster than ever.

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“…(88) When other factors such as major vessels or urethral warmers are added to the treatment scenario, this assumption may or may not be true. (89) Additionally, there is currently no reliable MR compatible temperature monitoring devices to confirm lethal temperatures. Confounding the need for good margin coverage is the problem of very restrictive space in and around the prostate bed with close proximity to the rectum, bladder, and external striated urethral sphincter with very little margin for error.…”

Section: Challenges To Mr Guidancementioning

confidence: 99%

Targeted prostate biopsy and MR-guided therapy for prostate cancer

et al. 2016

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Prostate cancer is the most commonly diagnosed noncutaneous cancer and second-leading cause of death in men. Many patients with clinically organ confined prostate cancer undergo definitive treatment of the whole gland including radical prostatectomy, radiation therapy and cryosurgery. Active surveillance is a growing alternative option for patients with documented low volume, low grade prostate cancer. With recent advances in software and hardware of MRI, multiparametric MRI of the prostate has been shown to improve the accuracy in detecting and characterizing clinically significant prostate cancer. Targeted biopsy is increasingly utilized to improve the yield of MR detected, clinically significant prostate cancer and to decrease in detection of indolent prostate cancer. MR guided targeted biopsy techniques include cognitive MR fusion TRUS biopsy, in-bore transrectal targeted biopsy using robotic transrectal device, and in-bore direct MR guided transperineal biopsy with a software based transperineal grid template. In addition, advances in MR compatible thermal ablation technology allow accurate focal or regional delivery of optimal thermal energy to the biopsy proved, MRI detected tumor, utilizing cryoablation, laser ablation, high intensity focused ultrasound ablation under MR guidance and real time or near simultaneous monitoring of the ablation zone. Herein we present a contemporary review of MR guided targeted biopsy techniques of MR detected lesions as well as MR guided focal or regional thermal ablative therapies for localized naïve and recurrent cancerous foci of the prostate.

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An investigation of the effects from a urethral warming system on temperature distributions during cryoablation treatment of the prostate: A phantom study

Cited by 23 publications

References 19 publications

Fiber Optic Sensors for Temperature Monitoring during Thermal Treatments: An Overview

Fiber Optic Sensors for Temperature Monitoring during Thermal Treatments: An Overview

Magnetic Resonance–Guided Prostate Ablation

Targeted prostate biopsy and MR-guided therapy for prostate cancer

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