نتایج جستجو برای: conventional imaging

تعداد نتایج: 695223  

Journal: :Frontiers in Physics 2022

Photoacoustic (PA) signals are typically broadband in nature. The bandwidth of PA depends on the size distribution underlying chromophores. Typically, conventional ultrasound (US) transducers, designed for pulse-echo imaging, have limited bandwidth, which reduces their sensitivity to signal. rejection out-of-band impairs image reconstruction, leading loss details. Visualization biological struc...

2012
Lukas Reznicek Efstathios Vounotrypidis Florian Seidensticker Karsten Kortuem Anselm Kampik Aljoscha S Neubauer Armin Wolf

BACKGROUND This study's objective was to optimize the visualization of three different spectral-domain optical coherence tomography (SD-OCT) display modalities and evaluate enhanced depth imaging (EDI) by comparing the maximum depth of assessment in conventional versus inverted cross-sectional OCT images in healthy subjects and in patients with retinal pigment epithelial detachment (PED). MET...

Journal: :AJNR. American journal of neuroradiology 2000
S Cha E A Knopp G Johnson A Litt J Glass M L Gruber S Lu D Zagzag

BACKGROUND AND PURPOSE Dynamic, contrast-enhanced MR imaging has allowed quantitative assessment of cerebral blood volume (CBV) in brain tumors. The purpose of our study was to compare postcontrast T1-weighted imaging with dynamic, contrast-enhanced T2*-weighted echo-planar imaging in the evaluation of the response of recurrent malignant gliomas to thalidomide and carboplatin. METHODS Serial ...

Journal: :iranian journal of medical physics 0
masoomeh fooladi m.sc. in medical physics, medical physics and biomedical engineering dept., tehran university of medical sciences, tehran, iran nader riahi alam associate professor, medical physics and biomedical engineering dept., tehran university of medical sciences, tehran, iran mohammad hossein harirchyan associate professor, neurology dept., tehran university of medical sciences, tehran, iran kavoos firuznia associate professor, radiology dept., tehran university of medical sciences, tehran, iran mohammad ali oghabian associate professor, medical physics and biomedical engineering dept., tehran university of medical sciences, tehran, iran majid shakiba researcher, medical imaging research center, imam khomeini hospital, tehran university of medical sciences, tehran, iran

introduction: multiple sclerosis (ms) is a demyelinating disease of the central nervous system (cns), affecting mostly young people at a mean age of 30 years. magnetic resonance imaging (mri) is one of the most specific and sensitive methods in diagnosing and detecting the evolution of multiple sclerosis disease. but it does not have the ability to differentiate between distinct histopathologic...

Journal: :Journal of the American Society of Echocardiography : official publication of the American Society of Echocardiography 2009
Kenneth D Horton Rick W Meece Jeffrey C Hill

The assessment of right ventricular (RV) structure and function by echocardiography has been improved by advancements that include Doppler tissue imaging, strain imaging, and three-dimensional imaging. Doppler tissue imaging and strain imaging can be useful for the assessment of regional RV systolic and diastolic function. Three-dimensional imaging has been reported to determine RV volumes and ...

2016
Ilana Feain Chun-Chien Shieh Paul White Ricky O'Brien Sandra Fisher William Counter Peter Lazarakis David Stewart Simon Downes Michael Jackson Siddhartha Baxi Brendan Whelan Kuldeep Makhija Chen-Yu Huang Michael Barton Paul Keall

PURPOSE The purpose of this article is to present the first imaging experiments to demonstrate the functional equivalence between a conventional rotational gantry and a fixed-beam imaging geometry, and the feasibility of an iterative image-reconstruction technique under gravitational deformation. METHODS AND MATERIALS Experiments were performed using an Elekta Axesse with Agility MLC and XVI,...

Journal: :iranian journal of radiology 0
hui-zhao wu department of radiology, the third hospital of hebei medical university, hebei province biomechanical key laboratory of orthopedics, shijiazhuang, china mahrukh latif department of radiology, the third hospital of hebei medical university, hebei province biomechanical key laboratory of orthopedics, shijiazhuang, china zhi-wei zhong department of radiology, the third hospital of hebei medical university, hebei province biomechanical key laboratory of orthopedics, shijiazhuang, china bao-hai yu department of radiology, the third hospital of hebei medical university, hebei province biomechanical key laboratory of orthopedics, shijiazhuang, china wen-juan wu department of radiology, the third hospital of hebei medical university, hebei province biomechanical key laboratory of orthopedics, shijiazhuang, china; department of radiology, the third hospital of hebei medical university, no.139, ziqiang road, shijiazhuang, 050051, china. tel: +86-31188603366, fax: +86-31187023626 feng zhang department of rehabilitation medicine, the third hospital of hebei medical university, shijiazhuang, china

conclusion dt-sfp can improve the detection of relatively early bone abnormalities in acetabular and proximal femur compared with conventional radiography. dt-sfp can also observe the abnormal impact between acetabular and proximal femur. patients and methods ninety-four consecutive patients with discomfort around the hip joint underwent dt-sfp and conventional radiography. the imaging features...

Journal: :AJNR. American journal of neuroradiology 1996
R W Allen H R Harnsberger C Shelton B King D A Bell R Miller J L Parkin R I Apfelbaum D Parker

PURPOSE To determine whether unenhanced high-resolution T2-weighted fast spin-echo MR imaging provides an acceptable and less expensive alternative to contrast-enhanced conventional T1-weighted spin-echo MR techniques in the diagnosis of acoustic schwannoma. METHODS We reviewed in a blinded fashion the records of 25 patients with pathologically documented acoustic schwannoma and of 25 control...

Journal: :Annals of oncology : official journal of the European Society for Medical Oncology 2008
S Mahner S Schirrmacher W Brenner L Jenicke C R Habermann N Avril J Dose-Schwarz

BACKGROUND The presence, extent and localization of distant metastases are key prognostic factors in breast cancer patients and play a central role in therapeutic decision making. The aim of this study was to compare the diagnostic performance of positron emission tomography using 2-[fluorine-18]fluoro-2-deoxy-D-glucose (FDG-PET) with that of computed tomography (CT) and conventional imaging in...

Journal: :archives of breast cancer 0
sahel heydarheydari department of medical physics, faculty of medicine, kermanshah university of medical sciences, kermanshah, iran abbas haghparast department of medical physics, faculty of medicine, kermanshah university of medical sciences, kermanshah, iran

background: despite developments in surgical treatment, radiation therapy, and chemotherapy protocols, tumor recurrence and metastasis are still major problems in breast cancer management. the aim of the present report was to review and compare the performance of pet/ct with some of the conventional imaging modalities in detection of breast cancer recurrence. methods: a literature search was pe...

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