Browsing NTNU Open by Author "Angelsen, Bjørn Atle J."
Now showing items 1-9 of 9
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Analysis of acoustic impedance matching in dual-band ultrasound transducers
Myhre, Ola Finneng; Johansen, Tonni Franke; Angelsen, Bjørn Atle J. (Journal article; Peer reviewed, 2017)Dual-frequency band probes are needed for ultrasound (US) reverberation suppression and are useful for image-guided US therapy. A challenge is to design transducer stacks that achieve high bandwidth and efficiency at both ... -
Analysis of acoustic impedance matching in dual-band ultrasound transducers
Myhre, Ola Finneng; Johansen, Tonni Franke; Angelsen, Bjørn Atle J. (Journal article; Peer reviewed, 2017)Dual-frequency band probes are needed for ultrasound (US) reverberation suppression and are useful for image-guided US therapy. A challenge is to design transducer stacks that achieve high bandwidth and efficiency at both ... -
Cooling of Transducer array used for Ultrasound radiation Force
Risbakk, Håkon (Master thesis, 2015)This thesis proposed a way to cool an ultrasound transducer. The cooling method is to have a an area on the casing of the transducer that has a high thermal conductivity, and a high emissivity. This layer is meant to ... -
Development of a medical grade 250V power supply unit for use in SURF ultrasound scanners
Criado Rabadán, Daniel (Master thesis, 2009)This report considers the design, calculation and manufacturing of a Switching Mode Power Supply for a SURF ultrasound scanner. The objective is obtaining an output voltage for feeding the amplifiers of the transducers, ... -
Real Time Delay Estimation and Correction for a new dual Frequency Method in Ultrasound Imaging
Tangen, Thor Andreas (Master thesis, 2006)A new dual frequency ultrasound imaging technique, uses a low frequency pulse to manipulate the propagation velocity and scattering conditions for the high frequency imaging pulse. With this new technique, the non-linearly ... -
Suppression of multiple Scattering and imaging of nonlinear Scattering in Ultrasound imaging
Jahren, Tollef Struksnes (Master thesis, 2013)The work presented is based on an imaging method using dual-frequency band pulses for imaging of nonlinear scatters from stiff particles like micro calcifications. The pulse complex consist of a high-frequency imaging pulse ... -
Ultrasound Radiation Force for Increased Transport of Drugs in Cancer Tumors
Vea, Siri (Master thesis, 2014)Cancer is today one of the leading causes of death world wide. Chemotherapy is a cancer treatment where cytotoxic drugs are administered intravenously in order to kill the cancer cells. This is a therapy form which is ... -
Ultrasound radiation force transport of drugs in tumors
Sun, Xianhua (Master thesis, 2013)Chemotherapy effectiveness not only depends on drug penetration extent in target tissues or tumor cells, but also depends on drug suppression extent by the normal tissues and cells. Ultrasound acts as an important role to ... -
Using SURF imaging for efficient detection of micro-calcifications
Denarie, Bastien Emmanuel (Master thesis, 2010)The presence of clustered micro-calcifications is an important indicator of early stage breast cancers, and an efficient real-time ultrasound imaging support is needed for conducting needle biopsies. SURF is a dual-frequency ...