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Boppart SA, Herrmann JM, Pitris C, Stamper DL, Brezinski ME, Fujimoto JG. Real-Time Optical Coherence Tomography for Minimally Invasive Imaging of Prostate Ablation. ACTA ACUST UNITED AC 2010. [DOI: 10.3109/10929080109145996] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Zangos S, Eichler K, Thalhammer A, Schoepf JU, Costello P, Herzog C, Mack MG, Vogl TJ. MR-guided interventions of the prostate gland. MINIM INVASIV THER 2008; 16:222-9. [PMID: 17763096 DOI: 10.1080/13645700701520669] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
In recent years MR imaging has played an increasingly important role in the diagnosis and treatment of prostate cancer. MR imaging of the prostate allows a clear delineation of the anatomic structures and prostate tumors when performing interventions such as biopsies, brachytherapy or thermal therapy of the prostate gland. MRI robotic assistance will improve the accuracy of the interventions. Due to the advantages of MR imaging MR-guided prostate interventions will play an increasing role in future.
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Affiliation(s)
- S Zangos
- Department of Diagnostic and Interventional Radiology, University Hospital Frankfurt, Johann Wolfgang Goethe-University, Frankfurt/Main, Germany.
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Vogl TJ, Lehnert T, Eichler K, Proschek D, Flöter J, Mack MG. Adrenal metastases: CT-guided and MR-thermometry-controlled laser-induced interstitial thermotherapy. Eur Radiol 2006; 17:2020-7. [PMID: 17180325 DOI: 10.1007/s00330-006-0516-7] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2005] [Revised: 06/22/2006] [Accepted: 10/20/2006] [Indexed: 10/23/2022]
Abstract
The aim of the study was to evaluate the feasibility, safety and effectiveness of CT-guided and MR-thermometry-controlled laser-induced interstitial thermotherapy (LITT) in adrenal metastases. Nine patients (seven male, two female; average age 65.0 years; range 58.7-75.0 years) with nine unilateral adrenal metastases (mean diameter 4.3 cm) from primaries comprising colorectal carcinoma (n = 5), renal cell carcinoma (n = 1), oesophageal carcinoma (n = 1), carcinoid (n = 1), and hepatocellular carcinoma (n = 1) underwent CT-guided, MR-thermometry-controlled LITT using a 0.5 T MR unit. LITT was performed with an internally irrigated power laser application system with an Nd:YAG laser. A thermosensitive, fast low-angle shot 2D sequence was used for real-time monitoring. Follow-up studies were performed at 24 h and 3 months and, thereafter, at 6-month intervals (median 14 months). All patients tolerated the procedure well under local anaesthesia. No complications occurred. Average number of laser applicators per tumour: 1.9 (range 1-4); mean applied laser energy 33 kJ (range 15.3-94.6 kJ), mean diameter of the laser-induced coagulation necrosis 4.5 cm (range 2.5-7.5 cm). Complete ablation was achieved in seven lesions, verified by MR imaging; progression was detected in two lesions in the follow-up. The preliminary results suggest that CT-guided, MR-thermometry-controlled LITT is a safe, minimally invasive and promising procedure for treating adrenal metastases.
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Affiliation(s)
- Thomas J Vogl
- Department of Diagnostic and Interventional Radiology, University Hospital of Frankfurt, Johann Wolfgang Goethe University, Theodor-Stern Kai 7, 60590 Frankfurt am Main, Germany.
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Affiliation(s)
- Fatih Atug
- Department of Urology, Tulane University Health Sciences Center, 1430 Tulane Avenue, SL-42, New Orleans, LA, USA
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Larson BT, Bostwick DG, Corica AG, Larson TR. Histological changes of minimally invasive procedures for the treatment of benign prostatic hyperplasia and prostate cancer: clinical implications. J Urol 2003; 170:12-9. [PMID: 12796636 DOI: 10.1097/01.ju.0000072200.22089.c3] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
PURPOSE Benign prostatic hyperplasia (BPH) is near universal in aging men, creating tremendous costs in morbidity and surgical treatment. In the last decade numerous nonsurgical minimally invasive methods have emerged for ablation of prostatic tissue. MATERIALS AND METHODS We reviewed the recently published English language literature on minimally invasive techniques for treating BPH and cancer with an emphasis on histopathological findings. RESULTS We compared the spectrum of contemporary minimally invasive treatments for BPH and cancer, with an emphasis on histopathological results. Clinical results were summarized briefly for each treatment method. These procedures ablate tissue by thermal, cryogenic, chemical or enzymatic injury. The 5-year results for some techniques were promising, although long-term durability is still uncertain, and other methods were in preclinical or early clinical stages. Invariably the treated tissue was devitalized with a thin border of granulation tissue and fibrosis. These procedures have applications for BPH and prostate cancer, although some studies are limited to only 1 disease. CONCLUSIONS Minimally invasive procedures show promise of a durable replacement for surgical resection.
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Prudhomme M, Mattéi-Gazagnes M, Fabbro-Peray P, Puche P, Chabalier JP, Delacrétaz G, François-Michel LFM, Godlewski G. MRI thermodosimetry in laser-induced interstitial thermotherapy. Lasers Surg Med 2003; 32:54-60. [PMID: 12516072 DOI: 10.1002/lsm.10130] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
BACKGROUND AND OBJECTIVES The aim of this study was to establish a correlation between a thermal measurement and a magnetic resonance imaging (MRI) signal during laser-induced interstitial thermotherapy (LITT) in liver. STUDY DESIGN/MATERIALS AND METHODS Pig liver was irradiated for 15 minutes with a diode laser at two different powers, 0.5 W (450 J) and 1.5 W (1,350 J). Tissue temperature was monitored every 20 seconds using thermocouples. Thermosensitive MRI sequences (T(1)-weighted Turbo-Flash) were acquired with the same irradiation parameters. Correlation between MRI signals (SI) and temperature measures was defined at two different distances from the fiber (5 and 10 mm). RESULTS At 0.5 W, temperatures rose progressively up to a maximum increase of 9.5 degrees C at 5 mm and 4 degrees C at 10 mm after 15 minutes. The corresponding MRI signal decreased progressively to -27.6 SI at 5 mm and -18.5 SI at 10 mm. At 1.5 W, temperatures rose dramatically at 5 mm, reaching a plateau. The temperature elevation measured at the end of the irradiation was of 30 degrees C whereas at 10 mm it was only 14.5 degrees C. The MRI signal varied accordingly, remaining inversely proportional to temperature (-76 SI at 5 mm and -35.5 SI at 10 mm). CONCLUSIONS An inversely proportional relationship was observed between MRI signal in sequential Turbo-Flash and temperature. MRI should allow to analyze heat diffusion in the liver, and thus to monitor real-time LITT treatments.
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Affiliation(s)
- Michel Prudhomme
- Département de Chirurgie Digestive et de Cancérologie Digestive, rue du Pr R. Debré F30900 Nîmes, France.
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Barkauskas KJ, Lewin JS, Duerk JL. Variation correction algorithm: analysis of phase suppression and thermal profile fidelity for proton resonance frequency magnetic resonance thermometry at 0.2 T. J Magn Reson Imaging 2003; 17:227-40. [PMID: 12541231 DOI: 10.1002/jmri.10239] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
PURPOSE To develop and analyze the performance of the variation correction algorithm (VCA), a phase correction technique that mitigates the contribution of background phase variations by combining accurate alignment of echoes, K-space-based phase correction (as opposed to spatial polynomials), and extraction of alias-free phase difference images. MATERIALS AND METHODS A series of echo-shifted gradient-recalled echo (GRE) images was processed with K-space alignment and phase corrected with increasing sizes of M x M masks of central K-space coefficients. The extent of background phase variation suppression due to magnet field drift was assessed. Further, a simulated thermal profile was superimposed on the same data in a related experiment. Residual errors in reconstructed simulated thermal profiles were quantitatively characterized to estimate algorithm performance. RESULTS Using a 3 x 3 K-space mask, the VCA was able to 1) maintain the typical mean background error in a 35 x 35 pixel region of interest (ROI) at -0.1 degrees C; and 2) reconstruct, relative to the applied thermal profile, a phase-corrected profile that typically contains a 1.7 degrees C underestimation of peak temperature difference and a mean error along the 60 degrees C line of -0.8 degrees C. CONCLUSION The results suggest that thermal profiles can be accurately reconstructed at 0.2 T using the VCA, even in the presence of over 1 ppm spatially and temporally dependent field drift over a 1-hour time frame.
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Affiliation(s)
- Kestutis J Barkauskas
- Department of Radiology, University Hospitals of Cleveland and Case Western Reserve University, 11100 Euclid Avenue, Cleveland, OH 44106, USA
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Jolesz FA, Talos IF, Schwartz RB, Mamata H, Kacher DF, Hynynen K, McDannold N, Saivironporn P, Zao L. Intraoperative magnetic resonance imaging and magnetic resonance imaging-guided therapy for brain tumors. Neuroimaging Clin N Am 2002; 12:665-83. [PMID: 12687918 DOI: 10.1016/s1052-5149(02)00036-9] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Since their introduction into surgical practice in the mid 1990s, intraoperative MRI systems have evolved into essential, routinely used tools for the surgical treatment of brain tumors in many centers. Clear delineation of the lesion, "under-the-surface" vision, and the possibility of obtaining real-time feedback on the extent of resection and the position of residual tumor tissue (which may change during surgery due to "brain-shift") are the main strengths of this method. High-performance computing has further extended the capabilities of intraoperative MRI systems, opening the way for using multimodal information and 3D anatomical reconstructions, which can be updated in "near real time." MRI sensitivity to thermal changes has also opened the way for innovative, minimally invasive (LASER ablations) as well as noninvasive therapeutic approaches for brain tumors (focused ultrasound). Although we have not used intraoperative MRI in clinical applications sufficiently long to assess long-term outcomes, this method clearly enhances the ability of the neurosurgeon to navigate the surgical field with greater accuracy, to avoid critical anatomic structures with greater efficacy, and to reduce the overall invasiveness of the surgery itself.
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Affiliation(s)
- Ferenc A Jolesz
- Department of Radiology, Brigham and Women's Hospital, Harvard Medical School, 75 Francis Street, Boston, MA 02115, USA.
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Minhaj AM, Mann F, Milne PJ, Denham DB, Salas N, Nose I, Damgaard-Iversen K, Parel JM, Robinson DS. Laser interstitial thermotherapy (LITT) monitoring using high-resolution digital mammography: theory and experimental studies. Phys Med Biol 2002; 47:2987-99. [PMID: 12222861 DOI: 10.1088/0031-9155/47/16/313] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Laser interstitial thermotherapy (LITT) is a minimally-invasive laser hyperthermia procedure for the treatment of localized tumours. Real-time monitoring of LITT is essential to control the extent of tumour destruction and ensure safe and effective treatments. The feasibility of using high-resolution digital x-ray mammography to monitor LITT of breast cancer was evaluated. Tissue phantoms including polyacrylamide hydrogel and cadaver porcine tissue were heated using a 980 nm diode laser delivered through optical fibres with diffusing tips. Digital images of the tissue phantoms were recorded with a high-resolution digital stereotactic breast biopsy system during heating. The recorded images were processed and analysed to detect heat-induced changes. No changes were detected during heating of the hydrogel. Pixel-by-pixel subtraction of the initial image from images taken during laser heating shows observable thermally-induced changes around the fibre during laser irradiation that correlate with the thermal denaturation zone observed by gross anatomy. These experiments demonstrate that high-resolution digital x-ray mammography can be used to detect heat-induced tissue changes during experimental LITT in fibro-fatty tissue.
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Affiliation(s)
- Ahmed M Minhaj
- Ophthalmic Biophysics Center, Bascom Palmer Eye Institute, University of Miami, FL 33136, USA.
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Algermissen B, Philipp CM, Müller U, Urban P, Berlien HP. Interstitial Thermotherapy (ITT) Using Nd:YAG Laser as a New Option for the Treatment of Neuroma. ACTA ACUST UNITED AC 2001. [DOI: 10.1078/1615-1615-00019] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Mueller-Lisse UG, Frimberger M, Schneede P, Heuck AF, Muschter R, Reiser MF. Perioperative prediction by MRI of prostate volume six to twelve months after laser-induced thermotherapy of benign prostatic hyperplasia. J Magn Reson Imaging 2001; 13:64-8. [PMID: 11169805 DOI: 10.1002/1522-2586(200101)13:1<64::aid-jmri1010>3.0.co;2-k] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
The purpose of this study was to predict prostate volume outcome 6-12 months after interstitial, laser-induced thermotherapy (LITT) for benign prostatic hyperplasia (BPH) on the basis of prostate magnetic resonance (MR) images obtained within 48 hours before and after LITT. Twenty patients (age, 64.2 +/- 7.4 years) with symptomatic BPH had LITT of the transitional zone of the prostate. MRI was performed within 48 hours before and after LITT, and 6-12 months after LITT (late follow-up). MRI included axial and sagittal T2-weighted fast spin-echo (FSE) images and contrast-enhanced, axial T1-weighted images. Volumes of different prostatic compartments (total prostate, transitional zone, peripheral zone, LITT lesions) were measured by planimetry. Subtraction of LITT lesion volume less than 48 hours after LITT from total and transitional zone volume before LITT, respectively, predicted respective prostatic volumes at late follow-up. Pearson correlations of predicted and measured total prostate and transitional zone volumes were 0.972 and 0.975, respectively. Total prostate volume at late follow-up was accurately predicted (difference, -0.5 +/- 5.7 cc; P = 0.6981, two-tailed paired t-test). Transitional zone volume was underestimated (difference, -3.1 +/- 4.7 cc; P = 0.0075). Peripheral zone volume was overestimated (difference, 2.6 +/- 3.5 cc; P = 0.0034). Perioperative MRI allows accurate prediction of prostate volume 6-12 months after LITT for BPH. Underestimation of transitional zone volume may be due to ongoing growth of BPH. LITT appears to affect peripheral zone tissue outside the target region. J. Magn. Reson. Imaging 2001;13:64-68.
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Affiliation(s)
- U G Mueller-Lisse
- Institute of Clinical Radiology, Klinikum Grosshadern, Ludwig-Maximilians-Universität, D-81377 Muenchen, Germany.
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Peters RD, Chan E, Trachtenberg J, Jothy S, Kapusta L, Kucharczyk W, Henkelman RM. Magnetic resonance thermometry for predicting thermal damage: an application of interstitial laser coagulation in an in vivo canine prostate model. Magn Reson Med 2000; 44:873-83. [PMID: 11108624 DOI: 10.1002/1522-2594(200012)44:6<873::aid-mrm8>3.0.co;2-x] [Citation(s) in RCA: 104] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Magnetic resonance image-guidance for interstitial thermal therapy has proven to be a valuable tool in its traditional role in device localization and, more recently, in monitoring heat deposition within tissue. However, a quantitative understanding of how temperature-time exposure relates to thermal damage is crucial if the predictive value of real-time MR thermal-monitoring is to be fully realized. Results are presented on interstitial laser coagulation of two canine prostate models which are shown to provide an opportunity to evaluate three models of thermal damage based on a threshold maximum temperature, an Arrhenius damage integral, and a temperature-time product. These models were compared to the resultant lesion margin as derived from post-treatment T(1)- and T(2)-weighted MR images, as well as from direct histological evaluation of the excised canine prostate. Histological evaluation shows that the thermal-injury boundary can be predicted from a threshold-maximum temperature of approximately 51 degrees C or an equivalent Arrhenius t(43) period of 200 minutes, but it is not reliably predicted using the temperature-time product. The methods described in this study are expected to have implications for the treatment of benign prostatic hyperplasia and prostate cancer with interstitial laser coagulation, which will be the focus of future human studies.
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Affiliation(s)
- R D Peters
- Department of Medical Biophysics, University of Toronto, Toronto, Ontario, Canada.
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Mainster MA, Reichel E. Transpupillary Thermotherapy for Age-Related Macular Degeneration: Long-Pulse Photocoagulation, Apoptosis, and Heat Shock Proteins. Ophthalmic Surg Lasers Imaging Retina 2000. [DOI: 10.3928/1542-8877-20000901-03] [Citation(s) in RCA: 122] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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Affiliation(s)
- W M Gedroyc
- St Mary's Hospital Interventional MR Unit, London, UK
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Abstract
Magnetic resonance imaging (MRI)-based monitoring has been shown in recent years to enhance the effectiveness of minimally or noninvasive thermal therapy techniques, such as laser, radiofrequency, microwave, ultrasound, and cryosurgery. MRI's unique soft-tissue contrast and ability to image in three dimensions and in any orientation make it extremely useful for treatment planning and probe localization. The temperature sensitivity of several intrinsic parameters enables MRI to visualize and quantify the progress of ongoing thermal treatment. MRI is sensitive to thermally induced tissue changes resulting from the therapies, giving the physician a method to determine the success or failure of the treatment. These methods of using MRI for planning, guiding, and monitoring thermal therapies are reviewed.
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Affiliation(s)
- N J McDannold
- Department of Radiology, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts 02115, USA.
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Goldberg SN, Gazelle GS, Mueller PR. Thermal ablation therapy for focal malignancy: a unified approach to underlying principles, techniques, and diagnostic imaging guidance. AJR Am J Roentgenol 2000; 174:323-31. [PMID: 10658699 DOI: 10.2214/ajr.174.2.1740323] [Citation(s) in RCA: 676] [Impact Index Per Article: 28.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- S N Goldberg
- Department of Radiology, Beth Israel Deaconess Medical Center, Boston, MA 02215, USA
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Affiliation(s)
- E S Siegelman
- Department of Radiology, University of Pennsylvania Medical Center, Philadelphia 19104-4283, USA
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