Advantages of cooled fiber for monitoring laser tissue ablation through temporal and spectral analysis of RF ultrasound signal: A case study

Granchi, S.; Vannacci, E.; Breschi, L.; Biagi, E.

doi:10.1016/j.ultras.2017.07.012

Cited by 10 publications

(5 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Ultrasound echo decorrelation imaging is a kind of QUS parametric imaging techniques. Other QUS methods for monitoring thermal ablations include ultrasound attenuation coefficient [27,28], envelope statistics [19,29,30], mean scatterer spacing (MSS) [31,32,33], and Thermotherapy Ultrasonic View (TUV) [34]. The principle of monitoring ablation zone by ultrasound attenuation coefficient is that the ultrasound attenuation coefficient of ablation zone is higher than that of unheated tissue under the effects of coagulation necrosis and heat-induced gas bubbles [27,28].…”

Section: Discussionmentioning

confidence: 99%

“…The theoretical basis of monitoring ablation zones by MSS is that heating destroys the structure of partial coherent scatterers, resulting in a smaller MSS in ablation zones than in unheated tissues [31,32,33]. TUV is obtained by multidimensional spectral analysis of RF signals, but intra-operative ablation monitoring using TUV can be affected by heat-induced gas bubbles [34].…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Monitoring Microwave Ablation Using Ultrasound Echo Decorrelation Imaging: An ex vivo Study

Zhou

Wang

Song

et al. 2019

Sensors

View full text Add to dashboard Cite

In this study, a microwave-induced ablation zone (thermal lesion) monitoring method based on ultrasound echo decorrelation imaging was proposed. A total of 15 cases of ex vivo porcine liver microwave ablation (MWA) experiments were carried out. Ultrasound radiofrequency (RF) signals at different times during MWA were acquired using a commercial clinical ultrasound scanner with a 7.5-MHz linear-array transducer. Instantaneous and cumulative echo decorrelation images of two adjacent frames of RF data were calculated. Polynomial approximation images were obtained on the basis of the thresholded cumulative echo decorrelation images. Experimental results showed that the instantaneous echo decorrelation images outperformed conventional B-mode images in monitoring microwave-induced thermal lesions. Using gross pathology measurements as the reference standard, the estimation of thermal lesions using the polynomial approximation images yielded an average accuracy of 88.60%. We concluded that instantaneous ultrasound echo decorrelation imaging is capable of monitoring the change of thermal lesions during MWA, and cumulative ultrasound echo decorrelation imaging and polynomial approximation imaging are feasible for quantitatively depicting thermal lesions.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Monitoring Microwave Ablation Using Ultrasound Echo Decorrelation Imaging: An ex vivo Study

Zhou

Wang

Song

et al. 2019

Sensors

View full text Add to dashboard Cite

show abstract

“…It was found that TUV imaging could monitor the tissue structure changes by comparing the similarity with histological specimens, and Dice and Jaccard coefficients were obtained as 0.86 and 0.75. Granchi et al 101 compared cooled fiber with bare fiber in the LIA experiments of bovine liver in vitro and TUV imaging was implemented based on hyperspectral analysis. The result showed that the coagulation zone was obtained more accurately by TUV imaging after ablation with cooled fiber (Dice coefficient: 0.79, Jaccard coefficient: 0.66) than that of bare fiber (Dice coefficient: 0.50, Jaccard coefficient: 0.34), as compared to the corresponding optical images.…”

Section: Theory and Methodsmentioning

confidence: 99%

A Review of Quantitative Ultrasound-Based Approaches to Thermometry and Ablation Zone Identification Over the Past Decade

Zhou

et al. 2022

Ultrason Imaging

View full text Add to dashboard Cite

Percutaneous thermal therapy is an important clinical treatment method for some solid tumors. It is critical to use effective image visualization techniques to monitor the therapy process in real time because precise control of the therapeutic zone directly affects the prognosis of tumor treatment. Ultrasound is used in thermal therapy monitoring because of its real-time, non-invasive, non-ionizing radiation, and low-cost characteristics. This paper presents a review of nine quantitative ultrasound-based methods for thermal therapy monitoring and their advances over the last decade since 2011. These methods were analyzed and compared with respect to two applications: ultrasonic thermometry and ablation zone identification. The advantages and limitations of these methods were compared and discussed, and future developments were suggested.

show abstract

“…Some researchers have suggested the cyclic pulse ablation mode [16][17][18][19] , which partly lowers the maximum temperature in the central ablation region, reducing vaporization and carbonization occurrence, but it cannot achieve carbonization-free ablation under different parameters. Additionally, some researchers have designed probes with water-cooling features to mitigate high temperatures at the needle bar's tip, thereby lowering the risk of carbonization 20 .…”

Section: Introductionmentioning

confidence: 99%

Real-time monitoring of bioelectrical impedance for minimizing tissue carbonization in microwave ablation of porcine liver

Zhang,

Wei,

Qian

et al. 2024

Preprint

View full text Add to dashboard Cite

The charring tissue generated by high temperature during microwave ablation can affect the therapeutic effect, such as limiting the volume of the coagulation zone and causing rejection. This paper aimed to prevent tissue carbonization at the same time while delivering an appropriate thermal dose for effective ablations by employing a treatment protocol with real-time monitoring of bioelectrical impedance. Firstly, based on finite element simulation, the current field response under different ablation states. Next, the impedance changes measured by the electrodes were correlated to the physical state of the ablated tissue, and the degree of carbonization was monitored and controlled in real time. Finite element simulations revealed that the dielectric properties of biological tissues changed dynamically during the ablation process. The relative change rule of the electrical impedance magnitude of the ex vivo porcine liver throughout the entire MWA process and the reduction of the central region carbonization were obtained by the MWA experiment. Charring tissue was eliminated without water cooling at 40 W and significantly reduced at 50 W and 60 W. The carbonization during MWA can be reduced according to the relative change pattern of tissue electrical impedance for optimizing microwave thermal ablation efficacy.

show abstract

Advantages of cooled fiber for monitoring laser tissue ablation through temporal and spectral analysis of RF ultrasound signal: A case study

Cited by 10 publications

References 31 publications

Monitoring Microwave Ablation Using Ultrasound Echo Decorrelation Imaging: An ex vivo Study

Monitoring Microwave Ablation Using Ultrasound Echo Decorrelation Imaging: An ex vivo Study

A Review of Quantitative Ultrasound-Based Approaches to Thermometry and Ablation Zone Identification Over the Past Decade

Real-time monitoring of bioelectrical impedance for minimizing tissue carbonization in microwave ablation of porcine liver

Contact Info

Product

Resources

About