Quality assurance methods and phantoms for magnetic resonance imaging: Report of AAPM nuclear magnetic resonance Task Group No. 1

Price, Ronald R.; Axel, Leon; Morgan, Tommie J.; Newman, Robert W.; Perman, William H.; Schneiders, Nicholas J.; Selikson, Mark; Wood, Michael L.; Thomas, Stephen R.

doi:10.1118/1.596566

Cited by 273 publications

(233 citation statements)

References 1 publication

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“…O cálculo da uniformidade integral foi realizado conforme previamente descrito por PRICE et al (1990);OCH et al (1992) Os campos pulmonares apresentaram-se relativamente simétricos nas projeções dorsais e ventrais. Segundo a verificação dos três observadores, o pulmão direito estendeu-se de forma discreta mais caudalmente que o esquerdo em algumas imagens dorsais.…”

Section: Methodsunclassified

Avaliação cintilográfica de diferentes dosagens de Tecnécio-99m na padronização da perfusão pulmonar em cães da raça Rottweiller

Rodrigues¹,

Guerra

Alves

et al. 2010

Cienc. Rural

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Section: Methodsunclassified

Avaliação cintilográfica de diferentes dosagens de Tecnécio-99m na padronização da perfusão pulmonar em cães da raça Rottweiller

Rodrigues¹,

Guerra

Alves

et al. 2010

Cienc. Rural

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“…The noise measurements were normalized to that of the low resolution and compared with the corresponding normalized theoretic calculation. The subtraction-based estimation of the noise (37) was used rather than a single image to avoid estimation errors caused by artifacts in the background, which arise because of aliasing and insufficient performance of outer volume suppression. The results depicted in Fig.…”

Section: Snr and Spatial Resolution Analysismentioning

confidence: 99%

High‐resolution diffusion tensor imaging of the human pons with a reduced field‐of‐view, multishot, variable‐density, spiral acquisition at 3 T

Karampinos

Van

Olivero

et al. 2009

Magnetic Resonance in Med

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Diffusion tensor imaging of localized anatomic regions, such as brainstem, cervical spinal cord, and optic nerve, is challenging because of the existence of significant susceptibility differences, severe physiologic motion in the surrounding tissues, and the need for high spatial resolution to resolve the underlying complex neuroarchitecture. The aim of the methodology presented here is to achieve high-resolution diffusion tensor imaging in localized regions of the central nervous system that is motion insensitive and immune to susceptibility while acquiring a set of two-dimensional images with more than six diffusion encoding directions within a reasonable total scan time. We accomplish this aim by implementing self-navigated, multishot, variable-density, spiral encoding with outer volume suppression. We establish scan protocols for achieving equal signal-to-noise ratio at 1.2 mm and 0.8 mm in-plane resolution for reduced field-of-view diffusion tensor imaging of the brainstem. In vivo application of the technique on the human pons of three subjects shows a clear delineation of the multiple local neural tracts. By comparing scans acquired with varying in-plane resolution but with constant signal-to-noise ratio, we demonstrate that increasing the resolution and reducing the partial volume effect result in higher fractional anisotropy values for the corticospinal tracts.

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“…Calculations of the SNR of the phase-contrast magnitude images at peak systole and end diastole of the 3D PC-MR imaging measurements were performed as described by Price et al 24 S 1 and S 2 represent phase-contrast magnitude signals in a region of interest during different cardiac phases of similar mean velocity magnitude. By subtracting these images, an image containing minimum signal and maximum noise is obtained.…”

Section: Data Quantification and Visualizationmentioning

confidence: 99%

3D Cine Phase-Contrast MRI at 3T in Intracranial Aneurysms Compared with Patient-Specific Computational Fluid Dynamics

Ooij

Schneiders²,

Marquering

et al. 2013

AJNR Am J Neuroradiol

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BACKGROUND AND PURPOSE: CFD has been proved valuable for simulating blood flow in intracranial aneurysms, which may add to better rupture risk assessment. However, CFD has drawbacks such as the sensitivity to assumptions needed for the model, which may hinder its clinical implementation. 3D PC-MR imaging is a technique that enables measurements of blood flow. The purpose of this study was to compare flow patterns on the basis of 3D PC-MR imaging with CFD estimates.

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Quality assurance methods and phantoms for magnetic resonance imaging: Report of AAPM nuclear magnetic resonance Task Group No. 1

Cited by 273 publications

References 1 publication

Avaliação cintilográfica de diferentes dosagens de Tecnécio-99m na padronização da perfusão pulmonar em cães da raça Rottweiller

Avaliação cintilográfica de diferentes dosagens de Tecnécio-99m na padronização da perfusão pulmonar em cães da raça Rottweiller

High‐resolution diffusion tensor imaging of the human pons with a reduced field‐of‐view, multishot, variable‐density, spiral acquisition at 3 T

3D Cine Phase-Contrast MRI at 3T in Intracranial Aneurysms Compared with Patient-Specific Computational Fluid Dynamics

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