<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:creator>Debatin JF</dc:creator>
  <dc:creator>Davis CP</dc:creator>
  <dc:creator>Felblinger J</dc:creator>
  <dc:creator>McKinnon GC</dc:creator>
  <dc:date>1995</dc:date>
  <dc:description xmlns:ns0="xml" ns0:lang="en">PURPOSE
Two ultrafast phase-contrast (PC) data acquisition strategies, multishot echo-planar imaging (EPI)-PC and segmented k-space fast gradient-echo PC (FASTCARD-PC) were evaluated with regard to their measurement accuracy.


MATERIALS AND METHOD
Flow measurements of the ascending and descending aorta were acquired in 10 healthy volunteers with an electrocardiogram (ECG)-triggered eight-shot EPI-PC sequence (TR/TE/flip 16/7.4/45 degrees, 32-ms flow-phase interval, 2 x 2 mm in plane resolution), and FASTCARD-PC (six k-lines per band, TR/TE/flip 11/6.1/45 degrees, 132-ms flow-phase interval, 2 x 1 mm in plane resolution). These were compared to flow-volume data acquired with conventional cine-PC (TR/TE/flip 24/7/45 degrees, 48-ms flow-phase interval, 2 x 1 mm in plane resolution). Using cine-PC as a gold standard, the measurement accuracy of FASTCARD-PC and EPI-PC were determined.


RESULTS
Both EPI-PC and FASTCARD-PC significantly reduced data acquisition times compared to cine PC. EPI-PC flow measurements correlated well with aortic cine-PC flow-volume determinations (r = 0.98). Reflecting poorer temporal resolution, FASTCARD-PC measurements were less accurate (p &lt; 0.05), evidenced by poor correlation with cine-PC data (r = 0.62).


CONCLUSION
Ultrafast PC measurements are possible. In contrast to the segmented k-space PC technique, which is limited in temporal resolution, multishot EPI-PC provides high measurement accuracy in pulsatile vessles while keeping the image acquisition interval short enough for a comfortable breath-hold.</dc:description>
  <dc:identifier>https://sonar.ch/global/documents/185509</dc:identifier>
  <dc:language>eng</dc:language>
  <dc:relation>info:eu-repo/semantics/altIdentifier/doi/10.1007/bf01709848</dc:relation>
  <dc:relation>info:eu-repo/semantics/altIdentifier/pmid/7496887</dc:relation>
  <dc:source>Magma (New York, N.Y.). - 1995</dc:source>
  <dc:subject xmlns:ns1="xml" ns1:lang="en">Adult</dc:subject>
  <dc:subject xmlns:ns2="xml" ns2:lang="en">Aorta, Thoracic</dc:subject>
  <dc:subject xmlns:ns3="xml" ns3:lang="en">Blood Flow Velocity</dc:subject>
  <dc:subject xmlns:ns4="xml" ns4:lang="en">Evaluation Studies as Topic</dc:subject>
  <dc:subject xmlns:ns5="xml" ns5:lang="en">Female</dc:subject>
  <dc:subject xmlns:ns6="xml" ns6:lang="en">Humans</dc:subject>
  <dc:subject xmlns:ns7="xml" ns7:lang="en">Magnetic Resonance Angiography</dc:subject>
  <dc:subject xmlns:ns8="xml" ns8:lang="en">Magnetic Resonance Imaging, Cine</dc:subject>
  <dc:subject xmlns:ns9="xml" ns9:lang="en">Male</dc:subject>
  <dc:title xmlns:ns10="xml" ns10:lang="en">Evaluation of ultrafast phase-contrast imaging in the thoracic aorta.</dc:title>
  <dc:type>http://purl.org/coar/resource_type/c_6501</dc:type>
</oai_dc:dc>