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Titolo:
A high-resolution phantom for MRI
Autore:
Fellner, C; Muller, W; Georgi, J; Taubenreuther, U; Fellner, FA; Kalender, WA;
Indirizzi:
Univ Erlangen Nurnberg, Inst Med Phys, Erlangen, Germany Univ Erlangen Nurnberg Erlangen Germany nst Med Phys, Erlangen, Germany Univ Erlangen Nurnberg, Dept Diagnost Radiol, Erlangen, Germany Univ Erlangen Nurnberg Erlangen Germany gnost Radiol, Erlangen, Germany
Titolo Testata:
MAGNETIC RESONANCE IMAGING
fascicolo: 6, volume: 19, anno: 2001,
pagine: 899 - 904
SICI:
0730-725X(200107)19:6<899:AHPFM>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
MAGNETIC-RESONANCE SPECTROSCOPY; EUROPEAN-ECONOMIC-COMMUNITY; CONCERTED RESEARCH-PROJECT; TEST OBJECTS; TISSUE CHARACTERIZATION; SPINAL-CORD; EQUIPMENT; ARTIFACTS; PROTOCOLS; IMAGER;
Keywords:
MRI; phantom; spatial resolution; high resolution; quality assurance;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Citazioni:
15
Recensione:
Indirizzi per estratti:
Indirizzo: Fellner, C Univ Erlangen Nurnberg, Inst Med Phys, Erlangen, Germany Univ Erlangen Nurnberg Erlangen Germany s, Erlangen, Germany
Citazione:
C. Fellner et al., "A high-resolution phantom for MRI", MAGN RES IM, 19(6), 2001, pp. 899-904

Abstract

Assessment of spatial resolution is an important step to test the performance of new sequence techniques-especially ultrafast techniques with dedicated k-space trajectories or interpolation algorithms. Measurement of the modulation transfer function (MTF) is a rather difficult procedure, but using suitable resolution phantoms allows a simple visual evaluation of spatial resolution. In contrast to commonly used test objects with a very restricted number ofresolution patterns we developed a phantom containing resolution patterns from 0.1 to 1.5 mm in steps of 0.1 mm. One resolution pattern consists of five parallel Plexiglas strips with the distance of the strips being equal to their thickness. Together with a Plexiglas cuboid the resolution patternsare mounted on a Plexiglas plate on the bottom of the cylindrical phantom. An aqueous solution of manganese chloride is used to fill the phantom. High resolution cross sections (pixel size: 50 mum) through the resolution patterns were measured to confirm the correct dimensions of the phantom. To verify the appropriateness of the 0.1 and 0.2 mm stacks micro-CT images with a pixel size of 25 mum were acquired additionally for both patterns. Besides visual inspection evaluation of the profile function of signal intensity across the stacks demonstrates that the resolution patterns are sufficiently correct. T-1-weighted SE sequences with slightly different pixel sizes aswell as T-1- and T-2-weighted gradient echo sequences were applied to demonstrate some possible applications of this phantom. In conclusion, the proposed phantom is well suited to assess the spatial resolution qualitatively (i.e., visually) and quantitatively over a wide range in steps of 0.1 mm. (C) 2001 Elsevier Science Inc. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 22/01/20 alle ore 22:08:13