Spatial factors for quantifying constant flow velocity in a small tube phantom: comparison of phase-contrast cine-magnetic resonance imaging and the intraluminal Doppler guidewire method
| Autor: | Yoshiaki Komori, Munekuni Sato, Satoru Morita, Shinya Kojima, Yun Shen, Takeshi Okazaki, Eiko Ueno, Masami Hirata, Haruhiko Machida |
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| Rok vydání: | 2008 |
| Předmět: |
medicine.medical_specialty
Materials science Flow (psychology) Magnetic Resonance Imaging Cine Imaging phantom symbols.namesake Electrocardiography Optics medicine Image Processing Computer-Assisted Radiology Nuclear Medicine and imaging Tube (fluid conveyance) medicine.diagnostic_test Pixel business.industry Phantoms Imaging Models Cardiovascular Reproducibility of Results Magnetic resonance imaging Ultrasonography Doppler Coronary Vessels Cross section (geometry) Flow velocity symbols Radiology business Doppler effect Blood Flow Velocity |
| Zdroj: | Japanese journal of radiology. 27(9) |
| ISSN: | 1867-108X |
| Popis: | We examined the spatial factors influencing magnetic resonance (MR) flow velocity measurements in a small tube phantom and used the same measurements obtained with an intraluminal Doppler guidewire as reference. We generated constant flow velocities from approximately 40 to 370 cm/s in a tube 4 mm in diameter. We then performed segmented k-space, phase-contrast cine-MR imaging to quantify spatial peak flow velocities of one pixel and of five adjacent pixels as well as spatial mean velocities within regions of interest in a cross section of the phantom. Pixel dimensions ranged from 1.00 × 1.00 mm to 2.50 × 2.50 mm. We compared the MR measurements with the temporally averaged Doppler spectral peak velocities. For one pixel (r > 0.99: MR flow velocity for pixel dimension 1.00 × 1.00 mm = 1.03x + 9.8 cm/s), the linear correlation was excellent between flow velocities by MR and Doppler guidewire methods. However, for the five adjacent pixels, MR measurements were significantly underestimated using pixels 1.25 × 1.25 mm to 2.50 × 2.50 mm and for mean velocities for all pixel dimensions. Relatively high spatial resolution allows accurate MR measurement of constant flow velocity in a small tube at spatial peak velocities for one pixel. |
| Databáze: | OpenAIRE |
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