keyword
MENU ▼
Read by QxMD icon Read
search

Doppler ultrasound

keyword
https://www.readbyqxmd.com/read/28231064/three-dimensional-ultrasound-for-prenatal-assessment-of-conjoined-twins-additional-advantages
#1
Tuangsit Wataganara, Pornpimol Ruangvutilert, Prasert Sunsaneevithayakul, Kusol Russameecharoen, Katika Nawapun, Nisarat Phithakwatchara
Conjoined twins are a rare, but serious, complication of monozygotic twins. Early prenatal diagnosis of conjoined twins is increasingly made with transvaginal ultrasound and color Doppler studies. Most prenatally diagnosed conjoined twins are terminated due to the high perinatal mortality, but advancement in pediatric surgery has allowed for successful postnatal separation in a small number of cases, and some parents may consider this option over termination of pregnancy. It is important to get a detailed prenatal ultrasound for the site and extent of fusion for an accurate categorization...
February 23, 2017: Journal of Perinatal Medicine
https://www.readbyqxmd.com/read/28230569/procedure-oriented-torsional-anatomy-of-the-hand-for-spasticity-injection
#2
Joslyn John, John Cianca, Faye Chiou-Tan, Sindhu Pandit, Erin Furr-Stimming, Katherine H Taber
OBJECTIVES: To provide musculoskeletal ultrasound (MSKUS) images of hand anatomy in the position of hemiparetic flexion as a reference for spasticity injections. After a stroke, spasticity can result in anatomic distortion of the hand. Spasticity may require treatment with botulinum toxin or phenol injections. Anatomic distortion may decrease the accuracy of injections. Standard anatomic references are of limited utility because they are not in this spastic hemiparetic position. There presently is no anatomic reference in the literature for these spastic postures...
February 23, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28229841/-neuroimaging-and-blood-biomarkers-in-functional-prognosis-after-stroke
#3
REVIEW
João Paulo Branco, Joana Santos Costa, João Sargento-Freitas, Sandra Oliveira, Bruno Mendes, Jorge Laíns, João Pinheiro
INTRODUCTION: Stroke remains one of the leading causes of morbidity and mortality around the world and it is associated with an important long-term functional disability. Some neuroimaging resources and certain peripheral blood or cerebrospinal fluid proteins can give important information about etiology, therapeutic approach, follow-up and functional prognosis in acute ischemic stroke patients. However, among the scientific community, there is currently more interest in the stroke vital prognosis over the functional prognosis...
November 2016: Acta Médica Portuguesa
https://www.readbyqxmd.com/read/28228820/temperature-elevation-measured-in-a-tissue-mimicking-phantom-for-transvaginal-ultrasound-at-clinical-settings
#4
Piero Miloro, Eleanor Martin, Adam Shaw
INTRODUCTION: This paper reports the results of an audit to assess the possible thermal hazard associated with the clinical use of ultrasound scanners in UK Hospitals for transvaginal ultrasound imaging. METHODS: An anatomically relevant phantom composed of a block of agar-based tissue mimicking material with embedded thermal sensors was developed. Seventeen hospitals around the UK were visited and a total of 64 configurations were tested. A representative typical scanning protocol was adopted, which primarily used B-mode with 30 s periods of colour-flow and pulsed Doppler modes for both gynaecology and obstetrics pre-sets...
February 2017: Ultrasound: Journal of the British Medical Ultrasound Society
https://www.readbyqxmd.com/read/28227415/ultrasound-transducer-positioning-aid-for-fetal-heart-rate-monitoring
#5
Paul Hamelmann, Alex Kolen, Lars Schmitt, Rik Vullings, Hans van Assen, Massimo Mischi, Libertario Demi, Judith van Laar, Jan Bergmans, Paul Hamelmann, Alex Kolen, Lars Schmitt, Rik Vullings, Hans van Assen, Massimo Mischi, Libertario Demi, Judith van Laar, Jan Bergmans, Alex Kolen, Judith Van Laar, Paul Hamelmann, Libertario Demi, Lars Schmitt, Rik Vullings, Hans Van Assen, Massimo Mischi, Jan Bergmans
Fetal heart rate (fHR) monitoring is usually performed by Doppler ultrasound (US) techniques. For reliable fHR measurements it is required that the fetal heart is located within the US beam. In clinical practice, clinicians palpate the maternal abdomen to identify the fetal presentation and then the US transducer is fixated on the maternal abdomen where the best fHR signal can be obtained. Finding the optimal transducer position is done by listening to the strength of the Doppler audio output and relying on a signal quality indicator of the cardiotocographic (CTG) measurement system...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227349/automated-embolic-signal-detection-using-adaptive-gain-control-and-classification-using-anfis
#6
Praotasna Sombune, Phongphan Phienphanich, Sombat Muengtaweepongsa, Anuchit Ruamthanthong, Charturong Tantibundhit, Praotasna Sombune, Phongphan Phienphanich, Sombat Muengtaweepongsa, Anuchit Ruamthanthong, Charturong Tantibundhit, Praotasna Sombune, Charturong Tantibundhit, Phongphan Phienphanich, Sombat Muengtaweepongsa, Anuchit Ruamthanthong
This work proposes an automated system for real-time high-accuracy detection of cerebral embolic signals (ES) to couple with transcranial Doppler ultrasound (TCD) devices in diagnosing a risk of stroke. The algorithm employs Adaptive Gain Control (AGC) approach to capture suspected ESs in real-time. Then, Adaptive Wavelet Packet Transform (AWPT) and Fast Fourier Transform (FFT) are used to extract from them features most efficiently representing ES, which determined by Sequential Feature Selection technique...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227331/assessing-the-development-of-fetal-myocardial-function-by-a-novel-doppler-myocardial-performance-index
#7
Ahsan H Khandoker, F Marzbanrad, Y Kimura, Saeed Al Nuaimi, M Palaniswami, Ahsan H Khandoker, F Marzbanrad, Y Kimura, Saeed Al Nuaimi, M Palaniswami, Ahsan H Khandoker, Y Kimura, Saeed Al Nuaimi, F Marzbanrad, M Palaniswami
Doppler-derived myocardial performance index are used to assess aspects of systolic and diastolic function in adult as well as fetal heart. The Tei Index (TI) is a useful and non-invasive tool. The aim of this study was to determine normal values of fetal left ventricular (LV) TI in early (16-32 weeks) and late trimester (35-41 weeks) fetuses and to develop a new myocardial performance index (K-index; KI) which focuses on fetal diastolic interval when oxygenated blood from the placenta filled in the LV. Simultaneous recordings of Doppler Ultrasound Signal (DUS) of the LV outflow tracts and fetal electrocardiogram signals were obtained in 55 early- and late-trimester fetuses...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227290/pre-clinical-investigations-of-multi-path-propagation-in-transcranial-doppler-ultrasound-flow-phantom
#8
Alexander J Weir, Cheng-Xiang Wang, Stuart Parks, Alexander J Weir, Cheng-Xiang Wang, Stuart Parks, Alexander J Weir, Stuart Parks, Cheng-Xiang Wang
There are various practical situations in medical applications when pre-clinical investigations must be performed using a simulation environment or test bench prior to human studies. One example is the analysis of propagation channels in Transcanial Doppler (TCD) ultrasound (US), a signal processing challenge requiring the analysis of data from US waves scattered in three dimensions (3D). When examining the effects of scatterers in such channels, it is common to use a data acquisition test bench and a Doppler flow phantom...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227283/a-method-to-detect-tortuosity-of-vessel-using-non-imaging-ultrasound-approach-in-carotid-structure
#9
Ravindra B Patil, P Krishnamoorthy, Ravindra B Patil, P Krishnamoorthy, Ravindra B Patil, P Krishnamoorthy
Stroke is a leading cause of functional impairments. The typical screening mechanism is to measure localized Peak Systolic Velocity (PSV) and diagnose impending risk associated with stoke by characterizing the PSV values. However, an accurate measurement of PSV using Doppler ultrasound is affected due to the tortuous nature of carotid artery in elder population group as the angle at which acoustic beam strikes the vessel is over or under estimated resulting in improper measure the blood flow velocity. Hence, the proposed approach estimates the degree of tortuosity of the carotid vessel and includes this as calibration parameter to compute an accurate PSV...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226983/perspective-imaging-of-flow-in-arterial-model-obtained-with-continuous-wave-doppler-focusing-technique
#10
Ryo Nagaoka, Katsuhiro Sasaki, Seiichi Zama, Masaaki Nagone, Hiroshi Nagai, Yasuhito Takeuchi, Yoshifumi Saijo, Ryo Nagaoka, Katsuhiro Sasaki, Seiichi Zama, Masaaki Nagone, Hiroshi Nagai, Yasuhito Takeuchi, Yoshifumi Saijo, Yoshifumi Saijo, Hiroshi Nagai, Katsuhiro Sasaki, Masaaki Nagone, Seiichi Zama, Ryo Nagaoka, Yasuhito Takeuchi
Flowing emboli in the circulatory system cause fatal diseases such as stroke or pulmonary embolism. Conventional transcranial Doppler ultrasound for detection of emboli requires precise positioning by experienced examiner. In the present study, an easier emboli detection device by visualizing perspective view of blood vessel is proposed. The perspective image was obtained with continuous wave (CW) Doppler ultrasound from 2-dimensional array probe. CW Doppler signal from each element was focused by novel beam forming algorithm to obtain en face images at arbitrary depth to form perspective image...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226762/the-use-of-a-thermal-camera-and-eulerian-enhancement-in-the-examination-of-pedal-pulse-and-microvascular-health
#11
Stephanie L Bennett, Rafik A Goubran, Brendan Bennett, Rebecca A Bennett, Frank Knoefel, Stephanie L Bennett, Rafik A Goubran, Brendan Bennett, Rebecca A Bennett, Frank Knoefel, Stephanie L Bennett, Rafik A Goubran, Brendan Bennett, Rebecca A Bennett, Frank Knoefel
Early detection of impaired blood flow and microvascular functioning is important to prevent ulceration in diabetic patients. This paper aims to first determine if thermal video in conjunction with Eulerian Video Magnification (EVM) can be used to find the pedal pulse rate, and reveal patterns indicative of the foot's microvascular health. Thermal video was captured of a healthy adult's foot while a Doppler ultrasound captured pedal pulse. Another thermal video was captured of a patient's heels. These videos were subjected to EVM, areas of interest were defined and the mean intensity signal was calculated temporally, within each defined area...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226727/surgical-fiducial-segmentation-and-tracking-for-pose-estimation-based-on-ultrasound-b-mode-images
#12
Lei Chen, Nathanael Kuo, Fereshteh Aalamifar, David Narrow, Devin Coon, Jerry Prince, Emad M Boctor, Lei Chen, Nathanael Kuo, Fereshteh Aalamifar, David Narrow, Devin Coon, Jerry Prince, Emad M Boctor, David Narrow, Emad M Boctor, Devin Coon, Lei Chen, Jerry Prince, Nathanael Kuo, Fereshteh Aalamifar
Doppler ultrasound is a non-invasive diagnostic tool for the quantitative measurement of blood flow. However, given that it provides velocity data that is dependent on the location and angle of measurement, repeat measurements to detect problems over time may require an expert to return to the same location. We therefore developed an image-guidance system based on ultrasound B-mode images that enables an inexperienced user to position the ultrasound probe at the same site repeatedly in order to acquire a comparable time series of Doppler readings...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28225861/predictors-of-subclinical-atherosclerosis-evaluated-by-carotid-intima-media-thickness-in-asymptomatic-young-women-with-type-1-diabetes-mellitus
#13
Rosane Kupfer, Manuella Rangel Larrúbia, Isabela Bussade, Joana Rodrigues Dantas Pereira, Giovanna A Balarini Lima, Marcio Antonio Epifanio, Claudio Domenico Sahione Schettino, Denise Prado Momesso
Objective: This study aimed to evaluate the occurrence and clinical predictors of subclinical atherosclerosis in asymptomatic, young adult women with type 1 DM. Subjects and methods: The study included 45 women with type 1 diabetes mellitus (DM) (aged 36 ± 9 years) who underwent carotid Doppler ultrasound evaluation to determine the carotid artery intima-media thickness (CIMT) and to assess the occurrence of carotid artery plaques. Insulin sensitivity was assessed by estimated glucose disposal rate (eGDR), and metabolic syndrome (MS) was defined by the World Health Organization criteria...
February 16, 2017: Archives of Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28225646/conventional-and-zoomit-dwi-for-evaluation-of-testis-in-patients-with-ipsilateral-varicocele
#14
İsmail Okan Yıldırım, Semih Sağlık, Hüseyin Çelik
OBJECTIVE: The current study aimed to investigate the effects of varicocele on testis parenchyma by using ZOOMit DWI and conventional DWI and to compare both diffusion methods. SUBJECTS AND METHODS: Forty-five patients with unilateral varicocele diagnosed by physical examination and color Doppler ultrasound between July 2015 and December 2015 and 32 healthy volunteers were included in the study. ZOOMit and conventional DWI were performed for all patients with a 3-T MRI scanner...
February 22, 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/28225076/when-to-stop-propranolol-for-infantile-hemangioma
#15
Lei Chang, Yifei Gu, Zhang Yu, Hanru Ying, Yajing Qiu, Gang Ma, Hui Chen, Yunbo Jin, Xiaoxi Lin
There is no definitive conclusion regarding the optimal timing for terminating propranolol treatment for infantile hemangioma (IH). A total of 149 patients who underwent detailed color Doppler ultrasound examination were included in this study. The characteristics and propranolol treatment of all patients were summarized and analyzed. Patients were divided into two groups according to the lesion regression rate. Among the 149 patients, 38 were assigned to the complete regression group, and 111 were assigned to the partial regression group...
February 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28224305/high-frequency-color-doppler-ultrasound-as-the-first-diagnostic-and-monitoring-choice-for-early-superficial-high-flow-vascular-malformations
#16
Lei Chang, Dongze Lv, Yunbo Jin, Wenxin Yu, Xi Yang, Gang Ma, Hui Chen, Xiaoxi Lin
Diagnosis and monitoring of early high-flow vascular malformations could be a meaningful pursuit. However, there has been no ideal method for their long-term monitoring and prognosis. We examined 21 early high-flow vascular malformations in this study and deemed that high-frequency color Doppler ultrasound could be regarded as the first diagnostic and monitoring choice for early high-flow vascular malformations at present.
February 21, 2017: Journal of Medical Ultrasonics
https://www.readbyqxmd.com/read/28220936/type-3-takayasu-arteritis-diagnosed-by-parvus-tardus-renal-doppler-signal-modulation
#17
Ural Koc
Takayasu's arteritis is known to cover the youngest age group in the etiology of secondary hypertension. The type 3 pattern is rare and involves the thoraco-abdominal aorta and its main abdominal branches. Here, we present the imaging results of a patient who had been followed up for systemic arterial hypertension and was diagnosed with Takayasu's arteritis type 3 by CT and MR angiography following bilateral detection of a parvus-tardus Doppler signal modulation in the renal arteries. We discuss the differential diagnoses that should be considered when observing a tardus-parvus Doppler signal...
February 21, 2017: Journal of Clinical Ultrasound: JCU
https://www.readbyqxmd.com/read/28219656/ultrasound-abnormalities-in-septic-arthritis-are-associated-with-functional-outcomes
#18
Emeline Gaigneux, Grégoire Cormier, Stéphane Varin, Oriane Mérot, Yves Maugars, Benoit Le Goff
OBJECTIVES: To describe the ultrasound abnormalities seen in septic arthritis and to assess their associations with clinical, biological, and radiological outcomes METHODS: We prospectively included 34 patients with septic arthritis of a native joint (knee, n=19; shoulder, n=6; hip, n=4; ankle, n=3; or wrist, n=2). Ultrasonography was performed to record synovial-membrane thickness and vascularity, joint effusion, and abnormalities of adjacent soft tissues, at baseline then 4 days, 2 weeks, and 3 months later...
February 17, 2017: Joint, Bone, Spine: Revue du Rhumatisme
https://www.readbyqxmd.com/read/28219128/-correlation-between-polymorphism-of-angiotensin-converting-enzyme-gene-and-the-lower-extremity-atherosclerosis-in-type-2-diabetes-mellitus-patients
#19
Y Wang, T H Zhu, J W Tong, J F Wei, J X Sheng, X P Jin, L H Mu, X Chen
Objective: To explore the correlation between polymorphism of the angiotensin-converting enzyme (ACE) gene and lower extremity atherosclerosis (LEA) in type 2 diabetes mellitus (T2DM) patients. Methods: A total of 380 patients diagnosed with T2DM in Department of Endocrinology from June 2015 to March 2016 were enrolled and divided into two groups: group A had no LEA (n=120) and group B had LEA(n=260). Color doppler ultrasound was used to detect the vascular lesions of the patients. For all patients in groups A and B, the polymerase chain reaction (PCR) was applied to determined the insertion/deletion polymorphism in intron 16 of the ACE gene of the patients...
February 14, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/28218603/frequency-and-clinical-course-of-cerebral-embolism-in-patients-undergoing-transcatheter-left-atrial-appendage-closure
#20
Nicolas Majunke, Franziska Eplinius, Matthias Gutberlet, Sven Moebius-Winkler, Ingo Daehnert, Matthias Grothoff, Stephan Schürer, Norman Mangner, Philipp Lurz, Sandra Erbs, Katharina Kirsch, Gerhard Schuler, Marcus Sandri
AIMS: To assess silent and clinically apparent cerebral embolic events in patients undergoing transcatheter left atrial appendage closure. METHODS AND RESULTS: In this prospective single-center study 28 patients underwent percutaneous closure of the left atrial appendage. In all patients a diffusion-weighted magnetic resonance imaging (DWI-MRI) study was performed before, the day after the procedure and during routine follow-up after 45 days. All patients underwent neurological assessment at the time of DWI-MRI...
February 21, 2017: EuroIntervention
keyword
keyword
7984
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"