Search results for "CONTRAST MICROSCOPY"

showing 3 items of 13 documents

Flussquantifizierung in Koronar- und Bypass- gefäßen mit der MR-Phasenkontrasttechnik

2000

Ziel: Es sollte die Genauigkeit der MR-Phasenkontrastmethode zur Ermittlung des Flusses in Koronararterien und koronaren Bypassgefasen bestimmt werden. Material und Methode: Die MRT-Flussmessungen von 12 Patienten mit 22 Bypassgefasen wurden mit intraoperativ mittels Ultraschalldurchflussmethode bestimmten Flussen verglichen. Praoperativ wurden zusatzlich Flussmessungen in 28 Koronararterien von 20 Patienten durchgefuhrt. Zur MRT-Flussmessung wurde eine segmentierte 2D-Flash-Sequenz verwendet, die eine zeitliche Auflosung von 110 bzw. 125 ms aufwies. Dies ermoglichte die Akquisition von 6–8 Bildpaaren pro Herzzyklus. Ergebnisse: Es bestand eine signifikante Korrelation zwischen den Ergebnis…

lawbusiness.industryPhase contrast microscopyFlow quantificationMedicineRadiology Nuclear Medicine and imagingbusinessNuclear medicinelaw.inventionDer Radiologe
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Primary ciliary dyskinesia assessment by means of optical flow analysis of phase-contrast microscopy images

2014

Primary ciliary dyskinesia implies cilia with defective or total absence of motility, which may result in sinusitis, chronic bronchitis, bronchiectasis and male infertility. Diagnosis can be difficult and is based on an abnormal ciliary beat frequency (CBF) and beat pattern. In this paper, we present a method to determine CBF of isolated cells through the analysis of phase-contrast microscopy images, estimating cilia motion by means of an optical flow algorithm. After having analyzed 28 image sequences (14 with a normal beat pattern and 14 with a dyskinetic pattern), the normal group presented a CBF of 5.2 +/- 1.6 Hz, while the dyskinetic patients presented a 1.9 +/- 0.9 Hz CBF. The cutoff …

medicine.medical_specialtyChronic bronchitisPhase contrast microscopyOptical flowBeat (acoustics)Health InformaticsSensitivity and SpecificityPattern Recognition Automatedlaw.inventionTECNOLOGIA ELECTRONICAPrimary ciliary dyskinesialawOphthalmologyImage Interpretation Computer-AssistedMicroscopymedicineHumansMicroscopy Phase-ContrastRadiology Nuclear Medicine and imagingPrimary ciliary dyskinesiaMicroscopy VideoBronchiectasisRadiological and Ultrasound Technologybusiness.industryCiliumOptical flowActive contoursReproducibility of ResultsAnatomyImage Enhancementmedicine.diseaseComputer Graphics and Computer-Aided DesignCell TrackingSubtraction TechniqueFISICA APLICADABeat frequencyComputer Vision and Pattern RecognitionbusinessMATEMATICA APLICADAAlgorithmsFourier-Mellin transformCiliary Motility Disorders
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Anteil des frühen systolischen Flussanstiegs am antegrad fließenden Gesamtvolumen bei Phasenkontrast-Flussmessungen in Atemanhaltetechnik

2005

Purpose To evaluate the contribution of early systole for the assessment of antegrade aortic flow volume by breath-hold velocity-encoded magnetic resonance (MR) flow measurements. Materials and methods Expiratory breath-hold fast low-angle shot (FLASH) phase-contrast flow measurements (temporal resolution tRes 61 msec, shared phases) perpendicular to the proximal ascending aorta and short axis true fast imaging with steady-state precession (TrueFISP) cine MR ventriculometry (tRes 34.5 msec) were performed in ten healthy male volunteers on a 1.5 T MR system (Sonata, Siemens Medical Solutions). Antegrade aortic flow volume (AFV) and left ventricular stroke volume (LV-SV) were evaluated using …

medicine.medical_specialtyShort axisVentricular functionmedicine.diagnostic_testbusiness.industryPhase contrast microscopySignificant differenceMagnetic resonance imagingBlood flowlaw.inventionSurgeryVolume (thermodynamics)Flow (mathematics)Paired sampleslawmedicine.arteryAscending aortaLeft ventricular Stroke volumeMedicineRadiology Nuclear Medicine and imagingSystolebusinessNuclear medicineRöFo - Fortschritte auf dem Gebiet der Röntgenstrahlen und der bildgebenden Verfahren
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