Noninvasive Monitoring for Hyperthermia Based on Ultrasonic Tissue Characterization of B-Mode

Xinying, Ren; Wu, Shuicai; Zhang, Yi

doi:10.1109/icbbe.2007.303

Cited by 7 publications

(7 citation statements)

References 14 publications

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“…In the present study, we focused on two less studied variables that seem to affect EI: muscle temperature and fascicle angle. Indeed, several in vitro studies performed in different animal tissues and using different heating methods have consistently reported strong positive, linear relations between EI and temperature (~2% for each degree increase in temperature [18]; see other references [15,19,20]), suggesting that temperature directly affects EI. This might result from temperature changes altering wave propagation, resulting in backscattered ultrasound signals (15).…”

mentioning

confidence: 99%

“…This might result from temperature changes altering wave propagation, resulting in backscattered ultrasound signals (15). Higher temperatures promote increases in the speed of sound and, consequently, adjustments in image intensity, i.e., increases in echo signal amplitude resulting from alterations in attenuation and backscattered properties (15,18,20). In humans, heating seems to directly affect muscle vasculature, increase local metabolism, and promote release of adenosine triphosphate and nitric oxide (21).…”

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confidence: 99%

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Do Intramuscular Temperature and Fascicle Angle Affect Ultrasound Echo Intensity Values?

Pinto

Nosaka

et al. 2022

Medicine &Amp; Science in Sports &Amp; Exercise

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Purpose: Ultrasound-derived echo intensity (EI) has been used as a physiological marker for changes in skeletal muscle "quality" with physical training, disuse, aging, and neuromuscular disorders. However, the methodological and physiological factors influencing EI and its longitudinal change are still unclear. Here, we performed two separate experiments to investigate the effects of muscle temperature and fascicle angle, which are known to influence muscle tissue and sound wave properties and therefore affect EI. Methods: In experiment 1 (n = 16, 28.0 ± 6.6 yr), vastus lateralis (VL) ultrasonographic images were acquired and intramuscular temperature continuously recorded for 15 min after 20 min of heating to 40.4°C ± 0.7°C using a microwave device. In experiment 2 (n = 17, 30.2 ± 9.8 yr), VL sonographic images were obtained with the knee both fully extended (0°) and flexed to 90°and EI and fascicle angle measured post hoc. Fascicle movement was tracked during the passive knee flexion to ensure that sonographic images were obtained at the same muscle region. Knee flexion reduced muscle thickness, and we therefore reran analyses calculating EI using identical dimensions to minimize this effect. Results: EI decreased only immediately after the passive heating, and although a moderate, negative correlation was observed between EI and temperature (r rm = −0.36), the effect of muscle temperature was small ( β = 0.97 (−1.89 to −0.06) per degree Celsius, P = 0.051). Nonetheless, EI increased as fascicle angle decreased, and a large, negative correlation (r rm = −0.85) was observed; the effect of fascicle angle on EI was large ( β = 3.0 (−3.8 to −2.2) per degree, P < 0.01), and this was maintained when analyses were performed at a constant depth of the region of interest ( β = 3.5 (−4.4 to −2.7) per degree, P < 0.01). Conclusions: These findings support the hypothesis that fascicle angle meaningfully affects VL EI but provides weak evidence of a temperature effect in vivo. Thus, acute fascicle angle alterations should be accounted for in studies using EI measurements, and longer-term studies should consider whether changes in EI might be partly explained by a change in fascicle angle.

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confidence: 99%

mentioning

confidence: 99%

Do Intramuscular Temperature and Fascicle Angle Affect Ultrasound Echo Intensity Values?

Pinto

Nosaka

et al. 2022

Medicine &Amp; Science in Sports &Amp; Exercise

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“…Previous works, using different mediums, image ultrasound systems, and temperature controlled water bath as heating source have also indicated linear relations [16]. Other authors show that microwave thermotherapy applied to pig and bovine livers [13,14] also produce linear relations between AVGL and temperature rise. On the other hand, literature shows that therapeutic ultrasound (TUS) heating tends to produce non-linear relations between AVGL and temperature rise, once temperature increases in a fast way forced by the TUS pressure field (which is a spatially inhomogeneous source) [10].…”

Section: Discussionmentioning

confidence: 89%

“…The main effects observed are apparent image motion due to changes in speed-of-sound, and changes in image intensity due to variations in the amplitude of the echo signal caused by modifications in the attenuation and backscattered properties. Literature reports changes in the intensity of B-mode images mainly caused by temperature-related changes in backscattered energy (CBE) from tissue inhomogeneity [9][10][11][12][13][14]. The analysis of the temperature-dependent average grey-level feature (AVGL) was described in different papers, including images collected from ex-vivo porcine, bovine, and chicken samples heated by microwave radiation, therapeutic ultrasound and water-bath immersion, and correlations between AVGL and temperature were reported to be above 70% [10,[12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Uncertainty evaluation from non-invasive estimation of temperature variation using B-mode ultrasonic images from a plastic phantom

et al. 2015

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“…The fundamental physical assumption is that temperature variations induce wave propagation changes that modify the backscattered ultrasound signal and these changes have an expression in US images. Literature reports changes on the grey-level contents of B-Mode images mainly caused by temperature-related changes on backscattered energy from tissue inhomogeneities [4] [7][8] [9].…”

Section: Introductionmentioning

confidence: 99%

Non-invasive assessment of temperature variation in Ex-vivo renal tissue by tracking average grey-level from B-mode images

Alvarenga

Teixeira

Krüger

et al. 2012

2012 IEEE International Ultrasonics Symposium

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The average grey-levels (AVGL) calculated from BMode images were assessed for non-invasive temperature estimation in a porcine kidney sample. The porcine kidney was subjected to heating and cooling procedure with temperature varying from 36ºC to 45ºC. The sample was continuously imaged with an ultrasound scanner, and simultaneously temperature was measured at each 5 s using two Type-T thermocouples placed at the central region and at the bottom of the sample. The result shows that AVGL/Temperature relations were highly correlated for both regions, and considering heating and cooling periods. Besides, AVGL/Temperature functions estimated fitting errors inferior to ± 0.25 o C, indicating that it might be possible to track temperature changes from both tissues using AVGL. This result is innovative since it suggests that AVGL seems to be robust to estimate non-invasively temperature variations in B-mode images from tissues presenting a complex morphological structure.Index Terms -Non-invasive temperature assessment, ultrasound, image processing, average grey-level, kidney. This work was supported by Brazilian Agencies CNPq (303769/2011-4), FAPERJ (E-26/110.299/2012) and CAPES.André V. Alvarenga is with the

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Noninvasive Monitoring for Hyperthermia Based on Ultrasonic Tissue Characterization of B-Mode

Cited by 7 publications

References 14 publications

Do Intramuscular Temperature and Fascicle Angle Affect Ultrasound Echo Intensity Values?

Do Intramuscular Temperature and Fascicle Angle Affect Ultrasound Echo Intensity Values?

Uncertainty evaluation from non-invasive estimation of temperature variation using B-mode ultrasonic images from a plastic phantom

Non-invasive assessment of temperature variation in Ex-vivo renal tissue by tracking average grey-level from B-mode images

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