Inter-frame Motion Correction for MR Thermometry

Suprijanto, S.; Vogel, Mika W.; Vos, Frans M.; Vrooman, Henri A.; Vossepoel, Albert M.

doi:10.1007/11566465_72

Cited by 4 publications

(2 citation statements)

References 9 publications

(17 reference statements)

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“…However, these potential improvements given by parallel imaging could not be tested in the present work because of the limited number of elements of the receiver coil integrated in the HIFU platform. Other strategies have been proposed for the correction of temperature images 19 and interscan motion 20, and may provide alternative solutions to improve MR thermometry.…”

Section: Discussionmentioning

confidence: 99%

Real‐time volumetric MRI thermometry of focused ultrasound ablation in vivo: a feasibility study in pig liver and kidney

et al. 2010

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a MR thermometry offers the possibility to precisely guide high-intensity focused ultrasound (HIFU) for the noninvasive treatment of kidney and liver tumours. The objectives of this study were to demonstrate therapy guidance by motion-compensated, rapid and volumetric MR temperature monitoring and to evaluate the feasibility of MR-guided HIFU ablation in these organs. Fourteen HIFU sonications were performed in the kidney and liver of five pigs under general anaesthesia using an MR-compatible Philips HIFU platform prototype. HIFU sonication power and duration were varied. Volumetric MR thermometry was performed continuously at 1.5 T using the proton resonance frequency shift method employing a multi-slice, single-shot, echo-planar imaging sequence with an update frequency of 2.5 Hz. Motion-related suceptibility artefacts were compensated for using multi-baseline reference images acquired prior to sonication. At the end of the experiment, the animals were sacrificed for macroscopic and microscopic examinations of the kidney, liver and skin. The standard deviation of the temperature measured prior to heating in the sonicated area was approximately 1-C in kidney and liver, and 2.5-C near the skin. The maximum temperature rise was 30-C for a sonication of 1.2 MHz in the liver over 15 s at 300 W. The thermal dose reached the lethal threshold (240CEM 43 ) in two of six cases in the kidney and four of eight cases in the liver, but remained below this value in skin regions in the beam path. These findings were in agreement with histological analysis. Volumetric thermometry allows real-time monitoring of the temperature at the target location in liver and kidney, as well as in surrounding tissues. Thermal ablation was more difficult to achieve in renal than in hepatic tissue even using higher acoustic energy, probably because of a more efficient heat evacuation in the kidney by perfusion.

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Section: Discussionmentioning

confidence: 99%

Real‐time volumetric MRI thermometry of focused ultrasound ablation in vivo: a feasibility study in pig liver and kidney

et al. 2010

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“…This cumulative sum method of calculating hCBE at each time stamp has been used in MR thermometry previously to account for measurement-to-measurement motion, and was utilized in this work to minimize motion artifacts from sample motion over the measurement period [85]. A block diagram of the modified NLSF and NLFC methods is provided in Figure 2.10.…”

Section: Nlfc Methods Hcbe Calculationmentioning

confidence: 99%

Development Of A Nonlinear Frequency Compounding Method With Applications In Ultrasound Imaging And Thermometry

Hornsby¹

2021

Preprint

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<div>Frequency compounding is an ultrasound imaging technique used to reduce artifacts and improve signal-to-noise-ratio (SNR). In this work a new nonlinear frequency compounding (NLFC) method was introduced, and its application in B-mode imaging and noninvasive thermometry was investigated. NLFC input frequencies were optimized to maximize speckle-signal-to-noise-ratio (SSNR) in a tissue mimicking phantom, and the method was then used to produce maps of the temperature sensitive change in backscattered energy of acoustic harmonics (<i>h</i>CBE) during heating of ex vivo porcine tissue with a focused ultrasound transducer. A <i>h</i>CBE-to-temperature calibration was also performed and temperature maps produced. Lastly, a comparative study of the NLFC and previously used nonlinear single frequency (NLSF) method was completed. By using the NLFC method it was concluded that SSNR of B-mode and backscattered energy images, SNR of <i>h</i>CBE maps, and temperature map agreement with a theoretical COMSOL based model were improved over the previously used NLSF method.</div>

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Development of an ultrasonic nonlinear frequency compounding method with applications in tissue thermometry

Hornsby

Shaswary

Tavakkoli

2021

The Journal of the Acoustical Society of America

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Frequency compounding is an ultrasound imaging technique used to improve signal-to-noise ratio (SNR). In this work, a nonlinear frequency compounding (NLFC) method was introduced, and its application in noninvasive tissue thermometry investigated. The NLFC method was used to produce two-dimensional maps of the temperature sensitive change in backscattered energy of acoustic harmonics (hCBE), during heating of ex vivo porcine tissue with a low intensity focused ultrasound transducer. A hCBE-to-temperature calibration was performed, and temperature maps produced and compared with a theoretical COMSOL based model. Last, a comparative study of the NLFC and previously used nonlinear single frequency (NLSF) methods was completed to quantify the improvement in SNR of the produced hCBE maps. When using the NLFC method, a SNR of 6.06 ± 1.28 was found. SNR values of 3.70 ± 0.53 and 4.38 ± 0.84 were found while using central frequencies of 4.31 and 5.43 MHz, respectively, with the NLSF method. This translates to an improvement of (64.13 ± 4.16)% over the 4.31 MHz NLSF, and (38.72 ± 2.97)% over the 5.43 MHz NLSF methods overall. It was concluded that the NLFC method can produce hCBE and temperature maps with superior image SNR over the NLSF method.

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Inter-frame Motion Correction for MR Thermometry

Cited by 4 publications

References 9 publications

Real‐time volumetric MRI thermometry of focused ultrasound ablation in vivo: a feasibility study in pig liver and kidney

Real‐time volumetric MRI thermometry of focused ultrasound ablation in vivo: a feasibility study in pig liver and kidney

Development Of A Nonlinear Frequency Compounding Method With Applications In Ultrasound Imaging And Thermometry

Development of an ultrasonic nonlinear frequency compounding method with applications in tissue thermometry

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