International Journal of Sports and Exercise Medicine, 2018
Purpose: Several measures are applied to characterize the functional state of muscles. Among thes... more Purpose: Several measures are applied to characterize the functional state of muscles. Among these, the Maximum Voluntary Contraction (MVC) is most frequently used and considered the gold standard. A little understood and used measure is Neuromuscular Efficiency (NME) of muscles. Therefore, the present study was conducted to compare NME indices of several trunk muscles of healthy adults with respect to age and sex. Methods: Overall 100 healthy Caucasian subjects (equally distributed in young (19-39 years) and elderly (48-71 years) and persons of both sexes, i.e. 25 subjects per age group and sex) were investigated during submaximal and maximal isometric tasks of their trunk muscles in sagittal plane. Five major superficial trunk muscles were evaluated by means of Surface EMG (SEMG). NME and MVC values were extracted. NME was calculated using the inverse slope of the logarithmic transform of the SEMG amplitude to torque relationships of the submaximal tests. Results: The abdominal muscles showed no sex differences in NME but were always superior in both elderly groups. As could be expected MVC levels during flexion of men were higher but interestingly no age related MVC differences could be detected. However, for the back muscles NME showed no age-related effects and during extension MVC was reduced with age. Males compared with females showed significantly higher NME indices and also higher MVC values. Absolute SEMG amplitudes levels of all investigated trunk muscles were always lower in the elderly subjects. Conclusions: The NME is an SEMG amplitude independent parameter and may be applied to determine the functional state of (trunk) muscles as a complement to MVC measurements. The observed systematic differences of NME indices between sexes and age groups careful hint towards the NME being related to the functional cross-sectional area of type I fibers.
2017 First IEEE MTT-S International Microwave Bio Conference (IMBIOC), 2017
Microwave imaging of weak scattering objects within a strong multi-path environment is a challeng... more Microwave imaging of weak scattering objects within a strong multi-path environment is a challenging task. Differential imaging is used when the wanted targets are subjected to induced or inherent changes while the surrounding keeps stable. The paper illustrates the approach of differential imaging, discusses the performance limitations by random signal perturbations, and shows some examples from medical engineering.
2017 11th European Conference on Antennas and Propagation (EUCAP)
We present a breast phantom for experimental medical microwave imaging. The phantom structures se... more We present a breast phantom for experimental medical microwave imaging. The phantom structures separating the tissue mimicking liquids are 3D-printed based on conductive materials. The skin is cast by silicone composites with carbon powder and graphite. In comparison to 3D printing with common plastic, this approach allows the simulation of anatomical breast structures with improved dielectric characteristics.
Purpose To investigate drug contamination of the working environment with paclitaxel drug-coated ... more Purpose To investigate drug contamination of the working environment with paclitaxel drug-coated balloon (DCB) angioplasty due to loss of paclitaxel containing particles from the coating during DCB preparation, insertion, and inflation. Material and Methods In an experimetal laboratory setting, drug loss during removal of the protective cover and insertion of the DCB through the hemostatic valve of the introducer sheath and after inflation was examined. In seven DCB types of different manufacturers, semi-quantitative image analysis was performed during five standardized tests cycles. Additionally, every DCB type passed one cycle of a wipe test and one cycle of air sampling. Results By removing the protective cover, the paclitaxel-covered balloon surface was significantly reduced in 3 out of 7 products (P = 0.043). Overall, extend of decline ranged from 0.4 to 12%. In 6 of 7 products, powdered paclitaxel clusters dropped down upon removal of the protective cover (0.099 ng/cm2 up to a...
2017 First IEEE MTT-S International Microwave Bio Conference (IMBIOC), 2017
This paper presents the results of a first self-experiment of one healthy volunteer by means of u... more This paper presents the results of a first self-experiment of one healthy volunteer by means of ultra-wideband sensing. Measurements are performed by M-sequence technology. First, we investigate the reproducibility of single measurement trials using a MIMO ultra-wideband breast imaging system. Results show that variations caused by a repositioning of the breast are higher than expected tumor responses, derived from phantom measurements. In a second scenario we use a two-channel ultra-wideband system with a sufficient measurement rate to consider the influence of human body vital signs. Investigations clearly show a detectability of breathing as well as heart activity.
ZusammenfassungDie Studie legt Normdaten für funktionsbezogene Kraft- und Aktivierungswerte währe... more ZusammenfassungDie Studie legt Normdaten für funktionsbezogene Kraft- und Aktivierungswerte während Flexion und Extension des Oberkörpers an gesunden Vergleichspersonen beiderlei Geschlechts in unterschiedlichen Altersgruppen vor. Dafür wurden jeweils 25 weibliche und männliche Personen in den Altersgruppen 20–40 Jahre (Junge), sowie 50–70 Jahre (Ältere) untersucht. Die Untersuchungen wurden in aufrechter Körperhaltung mit 100% des Oberkörpergewichts (90° Kippung), sowie während isometrischer Maximalkraftversuche, jeweils in Flexions- und Extensionsrichtung durchgeführt. Als funktionsbezogener Kraftwert wurde das Verhältnis zwischen den Werten während der Maximalkraftversuche und 100% Oberkörpergewichts- Halteübung als Oberkörper-Kraftverhältnis (OKKV), bzw. für das Oberflächen-EMG von Rumpfmuskeln als Muskel Aktivierungsverhältnis (MAV) bestimmt. Weiterhin wurde das Extensions- zu Flexionsverhältnis der maximalen Kraftwerte bestimmt (Ex-Flex-Ratio). Generell waren die funktionellen...
2021 IEEE Conference on Antenna Measurements & Applications (CAMA), 2021
The design of a multistatic ultra-wideband (UWB) microwave radar imaging system for breast cancer... more The design of a multistatic ultra-wideband (UWB) microwave radar imaging system for breast cancer detection is presented in this paper. Based on pseudo-noise code (M-sequence) technology, this multiple-input-multiple-output (MIMO) system includes 24 antennas and records data from 12S channels. Furthermore, it realizes complete rotation of the antenna array around the breast, which allows several options of clutter removal and differential imaging, respectively. The system underwent a first feasibility study on volunteers at University Hospital Jena. The procedure of examination and first experiences are described in this paper.
International Journal of Sports and Exercise Medicine, 2018
Purpose: Several measures are applied to characterize the functional state of muscles. Among thes... more Purpose: Several measures are applied to characterize the functional state of muscles. Among these, the Maximum Voluntary Contraction (MVC) is most frequently used and considered the gold standard. A little understood and used measure is Neuromuscular Efficiency (NME) of muscles. Therefore, the present study was conducted to compare NME indices of several trunk muscles of healthy adults with respect to age and sex. Methods: Overall 100 healthy Caucasian subjects (equally distributed in young (19-39 years) and elderly (48-71 years) and persons of both sexes, i.e. 25 subjects per age group and sex) were investigated during submaximal and maximal isometric tasks of their trunk muscles in sagittal plane. Five major superficial trunk muscles were evaluated by means of Surface EMG (SEMG). NME and MVC values were extracted. NME was calculated using the inverse slope of the logarithmic transform of the SEMG amplitude to torque relationships of the submaximal tests. Results: The abdominal muscles showed no sex differences in NME but were always superior in both elderly groups. As could be expected MVC levels during flexion of men were higher but interestingly no age related MVC differences could be detected. However, for the back muscles NME showed no age-related effects and during extension MVC was reduced with age. Males compared with females showed significantly higher NME indices and also higher MVC values. Absolute SEMG amplitudes levels of all investigated trunk muscles were always lower in the elderly subjects. Conclusions: The NME is an SEMG amplitude independent parameter and may be applied to determine the functional state of (trunk) muscles as a complement to MVC measurements. The observed systematic differences of NME indices between sexes and age groups careful hint towards the NME being related to the functional cross-sectional area of type I fibers.
2017 First IEEE MTT-S International Microwave Bio Conference (IMBIOC), 2017
Microwave imaging of weak scattering objects within a strong multi-path environment is a challeng... more Microwave imaging of weak scattering objects within a strong multi-path environment is a challenging task. Differential imaging is used when the wanted targets are subjected to induced or inherent changes while the surrounding keeps stable. The paper illustrates the approach of differential imaging, discusses the performance limitations by random signal perturbations, and shows some examples from medical engineering.
2017 11th European Conference on Antennas and Propagation (EUCAP)
We present a breast phantom for experimental medical microwave imaging. The phantom structures se... more We present a breast phantom for experimental medical microwave imaging. The phantom structures separating the tissue mimicking liquids are 3D-printed based on conductive materials. The skin is cast by silicone composites with carbon powder and graphite. In comparison to 3D printing with common plastic, this approach allows the simulation of anatomical breast structures with improved dielectric characteristics.
Purpose To investigate drug contamination of the working environment with paclitaxel drug-coated ... more Purpose To investigate drug contamination of the working environment with paclitaxel drug-coated balloon (DCB) angioplasty due to loss of paclitaxel containing particles from the coating during DCB preparation, insertion, and inflation. Material and Methods In an experimetal laboratory setting, drug loss during removal of the protective cover and insertion of the DCB through the hemostatic valve of the introducer sheath and after inflation was examined. In seven DCB types of different manufacturers, semi-quantitative image analysis was performed during five standardized tests cycles. Additionally, every DCB type passed one cycle of a wipe test and one cycle of air sampling. Results By removing the protective cover, the paclitaxel-covered balloon surface was significantly reduced in 3 out of 7 products (P = 0.043). Overall, extend of decline ranged from 0.4 to 12%. In 6 of 7 products, powdered paclitaxel clusters dropped down upon removal of the protective cover (0.099 ng/cm2 up to a...
2017 First IEEE MTT-S International Microwave Bio Conference (IMBIOC), 2017
This paper presents the results of a first self-experiment of one healthy volunteer by means of u... more This paper presents the results of a first self-experiment of one healthy volunteer by means of ultra-wideband sensing. Measurements are performed by M-sequence technology. First, we investigate the reproducibility of single measurement trials using a MIMO ultra-wideband breast imaging system. Results show that variations caused by a repositioning of the breast are higher than expected tumor responses, derived from phantom measurements. In a second scenario we use a two-channel ultra-wideband system with a sufficient measurement rate to consider the influence of human body vital signs. Investigations clearly show a detectability of breathing as well as heart activity.
ZusammenfassungDie Studie legt Normdaten für funktionsbezogene Kraft- und Aktivierungswerte währe... more ZusammenfassungDie Studie legt Normdaten für funktionsbezogene Kraft- und Aktivierungswerte während Flexion und Extension des Oberkörpers an gesunden Vergleichspersonen beiderlei Geschlechts in unterschiedlichen Altersgruppen vor. Dafür wurden jeweils 25 weibliche und männliche Personen in den Altersgruppen 20–40 Jahre (Junge), sowie 50–70 Jahre (Ältere) untersucht. Die Untersuchungen wurden in aufrechter Körperhaltung mit 100% des Oberkörpergewichts (90° Kippung), sowie während isometrischer Maximalkraftversuche, jeweils in Flexions- und Extensionsrichtung durchgeführt. Als funktionsbezogener Kraftwert wurde das Verhältnis zwischen den Werten während der Maximalkraftversuche und 100% Oberkörpergewichts- Halteübung als Oberkörper-Kraftverhältnis (OKKV), bzw. für das Oberflächen-EMG von Rumpfmuskeln als Muskel Aktivierungsverhältnis (MAV) bestimmt. Weiterhin wurde das Extensions- zu Flexionsverhältnis der maximalen Kraftwerte bestimmt (Ex-Flex-Ratio). Generell waren die funktionellen...
2021 IEEE Conference on Antenna Measurements & Applications (CAMA), 2021
The design of a multistatic ultra-wideband (UWB) microwave radar imaging system for breast cancer... more The design of a multistatic ultra-wideband (UWB) microwave radar imaging system for breast cancer detection is presented in this paper. Based on pseudo-noise code (M-sequence) technology, this multiple-input-multiple-output (MIMO) system includes 24 antennas and records data from 12S channels. Furthermore, it realizes complete rotation of the antenna array around the breast, which allows several options of clutter removal and differential imaging, respectively. The system underwent a first feasibility study on volunteers at University Hospital Jena. The procedure of examination and first experiences are described in this paper.
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Papers by Bernd Faenger