Microwave tomographic spectroscopy for an assessment tissue oxygenation

Semenov, Serguei; Kellam, James F; Williams, Thomas; Quinn, Michael; Nicholson, Brandi T.; Thirunavukkarasu, Sundaramoorthy

doi:10.1109/eucap.2012.6206563

Cited by 2 publications

(2 citation statements)

References 9 publications

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“…The dynamic range required for medical microwave imaging (from −40 to −135 dBm) is not typically available from commercial network analyzers; hence, a custom multichannel system was developed not only to measure the lower signal levels, but also to maintain high channel-to-channel isolation at the −135 dBm threshold. The cylindrical array geometry has been used extensively for medical imaging [25], [62], [63], and also for examining external limbs [64]. …”

Section: Methodsmentioning

confidence: 99%

Clinical Microwave Tomographic Imaging of the Calcaneus: A First-in-Human Case Study of Two Subjects

Meaney

Goodwin

Golnabi

et al. 2012

IEEE Trans. Biomed. Eng.

108

102

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We have acquired 2-D and 3-D microwave tomographic images of the calcaneus bones of two patients to assess correlation of the microwave properties with X-ray density measures. The two volunteers were selected because each had one leg immobilized for at least six weeks during recovery from a lower leg injury. A soft-prior regularization technique was incorporated with the microwave imaging to quantitatively assess the bulk dielectric properties within the bone region. Good correlation was observed between both permittivity and conductivity and the computed tomography-derived density measures. These results represent the first clinical examples of microwave images of the calcaneus and some of the first 3-D tomographic images of any anatomical site in the living human.

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Section: Methodsmentioning

confidence: 99%

Clinical Microwave Tomographic Imaging of the Calcaneus: A First-in-Human Case Study of Two Subjects

Meaney

Goodwin

Golnabi

et al. 2012

IEEE Trans. Biomed. Eng.

108

102

View full text Add to dashboard Cite

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“…Similar multi-antenna systems have been used for first clinical studies of breast imaging [4,5] as well, which is another very popular application of EMT systems. Later systems, as presented in [6], use vector network analyzer (VNA)s and external switching matrices to perform measurements of multi-antenna setups. Other setups for stroke detection are presented in [7], where a modified bicycle helmet represents the measuring chamber and again a VNA and a switching system are used for measurements.…”

Section: Introductionmentioning

confidence: 99%

A multiport vector network analyzer with high-precision and realtime capabilities for brain imaging and stroke detection

Poltschak

Freilinger

Feger

et al. 2018

Int. J. Microw. Wireless Technol.

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Medical imaging is of great importance for patients affected by stroke. Since an early examination of the patient is necessary for successful recovery, there is room to improve the existing capabilities of analysis. Common systems like magnetic resonance imaging or computed tomography are precise, but stationary, and therefore, not ideally suited for the early analysis of stroke. The presented multiport vector network analyzer system uses electromagnetic tomography (EMT) as an alternative imaging technique. It consists of a network of distributed electronic sensor nodes which improve important parameters: the parallel measurement setup reduces the measurement time as low as 160 ms for a 200-port S-parameter matrix and it is capable of measuring signal levels down to − 150 dBm. The electronics allow a compact, movable packaging, leading the way for future portable devices. The detection of stroke models was examined by test measurements of a phantom. The data was analyzed by the help of an inverse reconstruction algorithm. The possibility of building portable setups which can be even applied to patients inside an ambulance, makes EMT a suitable alternative for early stroke detection. It can help in shortening the recovery of patients, by providing an early analysis of the brain.

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Microwave tomographic spectroscopy for an assessment tissue oxygenation

Cited by 2 publications

References 9 publications

Clinical Microwave Tomographic Imaging of the Calcaneus: A First-in-Human Case Study of Two Subjects

Clinical Microwave Tomographic Imaging of the Calcaneus: A First-in-Human Case Study of Two Subjects

A multiport vector network analyzer with high-precision and realtime capabilities for brain imaging and stroke detection

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