Application of microwaves and millimeter waves for the characterization of teeth for dental diagnosis and treatment

Hoshi, N.; Nikawa, Yoshio; Kawai, Kunihiro; Ebisu, S.

doi:10.1109/22.681208

Cited by 42 publications

(24 citation statements)

References 5 publications

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“…Regarding the refractive index of tooth enamel and dentine, the results are similar to those reported by Ciesla et al 25 in the terahertz band and by Hoshi et al 26,27 at 35 GHz. The value of n( ) = 1.73 ± 0.29 that was measured here for skin is comparable with the value of 2 assumed in the work of Cole et al 3 , but is lower than that measured by Ghodgaonkar et al 31 in vivo at 57 GHz or the 1950 measurement at 23.6 GHz.…”

Section: Discussionsupporting

confidence: 80%

“…Further work 5 demonstrated that it was possible to measure enamel thickness accurately enough for comparative measures. In similar work on teeth, reported in the microwave literature, Hoshi et al 26,27 , made 10 measurements of the complex permittivity of tooth enamel and dentine over a range from 0.04 to 40 GHz. Conversion to refractive index using equation (2) gives a value for healthy tooth (the average of enamel and dentine) of n( ) = 2.61 at 35 GHz.…”

Section: 2mentioning

confidence: 95%

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Optical properties of tissue measured using terahertz-pulsed imaging

et al. 2003

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The first demonstrations of terahertz imaging in biomedicine were made several years ago, but few data are available on the optical properties of human tissue at terahertz frequencies. A catalogue of these properties has been established to estimate variability and determine the practicality of proposed medical applications in terms of penetration depth, image contrast and reflection at boundaries. A pulsed terahertz imaging system with a useful bandwidth 0.5-2.5 THz was used. Local ethical committee approval was obtained. Transmission measurements were made through tissue slices of thickness 0.08 to 1 mm, including tooth enamel and dentine, cortical bone, skin, adipose tissue and striated muscle. The mean and standard deviation for refractive index and linear attenuation coefficient, both broadband and as a function of frequency, were calculated. The measurements were used in simple models of the transmission, reflection and propagation of terahertz radiation in potential medical applications. Refractive indices ranged from 1.5 ± 0.5 for adipose tissue to 3.06 ± 0.09 for tooth enamel. Significant differences (P<0.05) were found between the broadband refractive indices of a number of tissues. Terahertz radiation is strongly absorbed in tissue so reflection imaging, which has lower penetration requirements than transmission, shows promise for dental or dermatological applications.

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Section: Discussionsupporting

confidence: 80%

Section: 2mentioning

confidence: 95%

Optical properties of tissue measured using terahertz-pulsed imaging

et al. 2003

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“…Traditionally, open-ended coaxial transmission lines [21]- [23] or open-ended rectangular waveguides [24] are used in the RF and microwave range. Coaxial probes are widely available, work over a large range of frequencies, and can thus be used both for time-and frequency-domain measurements.…”

Section: Test and Calibration Materials Mimicking Tissuementioning

confidence: 99%

Millimeter-Wave Tissue Diagnosis: The Most Promising Fields for Medical Applications

Töpfer

Oberhammer

2015

IEEE Microwave

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“…It is not a light burden for them. It is why the techniques of non-invasive measurement are strongly demanded [2], [3] The complex permittivity of blood is very sensitive to the glucose concentration in microwaves. Nevertheless, high loss of human tissues sometimes hide the change of complex permittivity, if we measure the permittivity from outside, noninvasively.…”

Section: Introductionmentioning

confidence: 99%

Blood-Sugar Monitoring by Reflection of Millimeter Wave

Nikawa

Michiyama

2007

2007 Asia-Pacific Microwave Conference

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Diabetes mellitus has now emerged as a serious public health problem in Asia. To control blood glucose level, blood-sugar monitoring is necessary. Nevertheless non-invasive blood-sugar monitoring technique has not been in practical use. Complex permittivity of blood is very sensitive to the glucose concentration in microwaves. In this paper, a new technique is proposed to obtain blood glucose level using a resonant applicator non-invasively. It is found from in vivo measurement of reflection coefficient using the resonant applicator, blood glucose level can be obtained by measuring the value of reflection coefficient at the resonant frequency.

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Application of microwaves and millimeter waves for the characterization of teeth for dental diagnosis and treatment

Cited by 42 publications

References 5 publications

Optical properties of tissue measured using terahertz-pulsed imaging

Optical properties of tissue measured using terahertz-pulsed imaging

Millimeter-Wave Tissue Diagnosis: The Most Promising Fields for Medical Applications

Blood-Sugar Monitoring by Reflection of Millimeter Wave

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