Preliminary study on monitoring the progression of osteoporosis using UWB radar technique in distal femur model

Lee, D.; Velander, Jacob; Blokhuis, Taco J.; Kim, K.; Augustine, Robin

doi:10.1049/el.2015.4166

Cited by 14 publications

(5 citation statements)

References 9 publications

(10 reference statements)

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“…These penetration depth performances are used in dosimetry studies, including microwave technology, and they have brought about many new exciting therapeutic and diagnostic solutions [ 5 , 6 ]. Recent studies show that the association of the microwave technique with biological applications is growing rapidly [ 7 , 8 , 9 , 10 , 11 , 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

Split-Ring Resonator Sensor Penetration Depth Assessment Using In Vivo Microwave Reflectivity and Ultrasound Measurements for Lower Extremity Trauma Rehabilitation

Shah

Velander

Mathur

et al. 2018

Sensors

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In recent research, microwave sensors have been used to follow up the recovery of lower extremity trauma patients. This is done mainly by monitoring the changes of dielectric properties of lower limb tissues such as skin, fat, muscle, and bone. As part of the characterization of the microwave sensor, it is crucial to assess the signal penetration in in vivo tissues. This work presents a new approach for investigating the penetration depth of planar microwave sensors based on the Split-Ring Resonator in the in vivo context of the femoral area. This approach is based on the optimization of a 3D simulation model using the platform of CST Microwave Studio and consisting of a sensor of the considered type and a multilayered material representing the femoral area. The geometry of the layered material is built based on information from ultrasound images and includes mainly the thicknesses of skin, fat, and muscle tissues. The optimization target is the measured S11 parameters at the sensor connector and the fitting parameters are the permittivity of each layer of the material. Four positions in the femoral area (two at distal and two at thigh) in four volunteers are considered for the in vivo study. The penetration depths are finally calculated with the help of the electric field distribution in simulations of the optimized model for each one of the 16 considered positions. The numerical results show that positions at the thigh contribute the highest penetration values of up to 17.5 mm. This finding has a high significance in planning in vitro penetration depth measurements and other tests that are going to be performed in the future.

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Section: Introductionmentioning

confidence: 99%

Split-Ring Resonator Sensor Penetration Depth Assessment Using In Vivo Microwave Reflectivity and Ultrasound Measurements for Lower Extremity Trauma Rehabilitation

Shah

Velander

Mathur

et al. 2018

Sensors

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show abstract

Section: Introductionmentioning

confidence: 99%

“…The resistive antennas can produce a pulse with reduced tail ringing at the expense of the low radiation efficiency. Owing to this, a planar type of resistive antennas was widely developed for near zone sensing applications up to date . In this article, we have explored the pulse radiating and imaging performances of the wrapped resistively loaded bow‐tie antenna (WRLBA).…”

Section: Introductionmentioning

confidence: 99%

“…In this regard, the impulse radar characterized by UWB pulse has widely utilized for near zone sensing applications. The applications in the vicinity of the targets can be included for not only medical applications, such as imaging of the breast tumor, [2][3][4][5] imaging of the bleeding area for stroke, [6][7][8] and assessment of bone mineral density, [9][10][11] but also industrial applications such as ground-penetrating radar (GPR), [12][13][14][15] through-wall penetrating radar, 16,17 and foliage-penetrating radar (FPR). 18,19 For near zone sensing applications, the proposed antenna should radiate a short pulse with less distorted waveform to receive a clear echo pulse reflected by the target.…”

Section: Introductionmentioning

confidence: 99%

“…Owing to this, a planar type of resistive antennas was widely developed for near zone sensing applications up to date. [9][10][11] In this article, we have explored the pulse radiating and imaging performances of the wrapped resistively loaded bow-tie antenna (WRLBA). This will be highly used in the area of the array measurement, where more than one antenna element are used in a given space, as an aperture size is dramatically reduced by wrapping the resistively loaded planar bow-tie antenna (RLPBA).…”

Section: Introductionmentioning

confidence: 99%

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Wrapped ultra‐wide band radar sensor based on resistively loaded bow‐tie antenna for near zone sensing applications

Lee

Melek

Shaker

2018

Micro & Optical Tech Letters

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This article presents the pulse radiating and imaging performances of a wrapped resistively loaded bow‐tie antenna (WRLBA) which has a reduced aperture size for utilizing near zone sensing applications. The pulse radiating performances of the WRLBA are investigated and evaluated by comparing to those of the nonloaded wrapped bow‐tie antenna (WBA). The calculated fidelity factor and evaluation factor (EF) of the WRLBA on the boresight direction are 0.97 and 0.07, respectively. The monostatic radar experiment has been shown that two copper targets with a radius of 2 cm are reconstructed at 15 and 20 cm, respectively. Based on the evaluation of the pulse radiating performances and imaging experiment, the proposed WRLBA is a suitable candidate for imaging applications in the vicinity of the targets.

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Development of a compact monocycle pulse generator for UWB impulse radar applications

Lee

Shaker

Melek

2020

Micro & Optical Tech Letters

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In this paper, a compact size (16 × 16 mm) of the monocycle pulse generator is proposed for Ultrawide‐band (UWB) impulse radar applications. The proposed circuit is based on the step recovery diodes (SRDs) and has a very simple structure. It consists of a coupling part, short pulse generating part, and monocycle forming part. The performance of the pulse generator is compared against simulation results which are performed by advanced design system (ADS). The measured monocycle waveform has a pulse width of 150 ps with the tail ringing level of −11 dB and symmetry of 87%. The corresponding spectrum has a center frequency of around 2.6 GHz with −10 dB bandwidth of 4 GHz. The performance of the pulse generator is validated by analyzing the receiving waveform. The pulse width and the ringing level of the received waveform are observed to be 250 ps and −11 dB, respectively. The developed compact monocycle pulse generator is very attractive because of the ease of integration into the limited physical space inside the UWB system.

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Preliminary study on monitoring the progression of osteoporosis using UWB radar technique in distal femur model

Cited by 14 publications

References 9 publications

Split-Ring Resonator Sensor Penetration Depth Assessment Using In Vivo Microwave Reflectivity and Ultrasound Measurements for Lower Extremity Trauma Rehabilitation

Split-Ring Resonator Sensor Penetration Depth Assessment Using In Vivo Microwave Reflectivity and Ultrasound Measurements for Lower Extremity Trauma Rehabilitation

Wrapped ultra‐wide band radar sensor based on resistively loaded bow‐tie antenna for near zone sensing applications

Development of a compact monocycle pulse generator for UWB impulse radar applications

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