Juan Parra-Robles
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Explore the profile of Juan Parra-Robles including associated specialties, affiliations and a list of published articles.
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Articles
32
Citations
405
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Recent Articles
21.
Marshall H, Deppe M, Parra-Robles J, Hillis S, Billings C, Rajaram S, et al.
Thorax
. 2012 Jan;
67(7):613-7.
PMID: 22286930
Background: Collateral ventilation has been proposed as a mechanism of compensation of respiratory function in obstructive lung diseases but observations of it in vivo are limited. The assessment of collateral...
22.
Marshall H, Ajraoui S, Deppe M, Parra-Robles J, Wild J
NMR Biomed
. 2011 Aug;
25(2):389-99.
PMID: 21837646
In hyperpolarised (3)He lung MRI with constant flip angles, the transverse magnetisation decays with each RF excitation imposing a k-space filter on the acquired data. For radial data acquired in...
23.
Deppe M, Parra-Robles J, Marshall H, Lanz T, Wild J
Magn Reson Med
. 2011 May;
66(6):1788-97.
PMID: 21574180
Parallel imaging presents a promising approach for MRI of hyperpolarized nuclei, as the penalty in signal-to-noise ratio typically encountered with (1)H MRI due to a reduction in acquisition time can...
24.
Deppe M, Parra-Robles J, Ajraoui S, Wild J
Magn Reson Med
. 2011 Mar;
65(4):1075-83.
PMID: 21413071
Washout of inert gases is a measure of pulmonary function well-known in lung physiology. This work presents a method combining inert gas washout and spatially resolved imaging using hyperpolarized (3)...
25.
Wild J, Ajraoui S, Deppe M, Parnell S, Marshall H, Parra-Robles J, et al.
NMR Biomed
. 2010 Sep;
24(2):130-4.
PMID: 20821726
The development of hybrid medical imaging scanners has allowed imaging with different detection modalities at the same time, providing different anatomical and functional information within the same physiological time course...
26.
Kraayvanger R, Bidinosti C, Dominguez-Viqueira W, Parra-Robles J, Fox M, Lam W, et al.
Magn Reson Med
. 2010 Jul;
64(5):1484-90.
PMID: 20593371
Regional measurement of alveolar oxygen partial pressure can be obtained from the relaxation rates of hyperpolarized noble gases, (3) He and (129) Xe, in the lungs. Recently, it has been...
27.
Ajraoui S, Lee K, Deppe M, Parnell S, Parra-Robles J, Wild J
Magn Reson Med
. 2010 Apr;
63(4):1059-69.
PMID: 20373407
In this work, the application of compressed sensing techniques to the acquisition and reconstruction of hyperpolarized (3)He lung MR images was investigated. The sparsity of (3)He lung images in the...
28.
Deppe M, Teh K, Parra-Robles J, Lee K, Wild J
J Magn Reson
. 2009 Dec;
202(2):180-9.
PMID: 19969495
This work explores slice profile effects in 2D slice-selective gradient-echo MRI of hyperpolarized nuclei. Two different sequences were investigated: a Spoiled Gradient Echo sequence with variable flip angle (SPGR-VFA) and...
29.
Deppe M, Parra-Robles J, Ajraoui S, Parnell S, Clemence M, Schulte R, et al.
J Magn Reson Imaging
. 2009 Jul;
30(2):418-23.
PMID: 19629971
Purpose: To compare susceptibility effects in hyperpolarized (3)He lung MRI at the clinically relevant field strengths of 1.5T and 3T. Materials And Methods: Susceptibility-related B(0) inhomogeneity was evaluated on a...
30.
Parra-Robles J, Viqueira W, Xu X, Ouriadov A, Santyr G
J Magn Reson
. 2008 Mar;
192(1):85-91.
PMID: 18358755
In this work, computer modeling based on a finite element method is used to simulate the T2* relaxation of hyperpolarized noble gases (HNG) in the lungs. A physical model of...