Masami Hirata
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Explore the profile of Masami Hirata including associated specialties, affiliations and a list of published articles.
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Articles
19
Citations
170
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Recent Articles
1.
Kojima S, Shinohara H, Hashimoto T, Hirata M, Ueno E
Radiol Phys Technol
. 2015 May;
8(2):295-304.
PMID: 25990884
This paper presents an iterative image reconstruction method for radial encodings in MRI based on a total variation (TV) regularization. The algebraic reconstruction method combined with total variation regularization (ART_TV)...
2.
Kojima S, Hirata M, Shinohara H, Ueno E
Radiol Phys Technol
. 2013 Apr;
6(2):375-84.
PMID: 23575652
In follow-up brain magnetic resonance imaging (MRI), precise reproducibility of the scan prescription is important so that over- or underestimating changes in volumes of clinical interest is prevented. (The scan...
3.
Kojima S, Suzuki K, Hirata M, Shinohara H, Ueno E
J Magn Reson Imaging
. 2012 Nov;
37(3):652-9.
PMID: 23172691
Purpose: To assess the ability of magnetic resonance imaging (MRI) to depict the semicircular canals of the inner ear by comparing results from the sampling perfection with application-optimized contrasts by...
4.
Machida H, Nunoda S, Shitakura K, Okajima K, Kubo Y, Hirata M, et al.
Int J Cardiovasc Imaging
. 2012 Oct;
29(1):151-7.
PMID: 23073906
Heart transplant recipients undergo annual screening of early-stage cardiac allograft vasculopathy (CAV) by invasive coronary flow reserve (CFR) measurement. We compared the sensitivity for CAV detection between the CFR measurement...
5.
Morita S, Kojima S, Hirata M, Suzuki K, Ueno E
J Magn Reson Imaging
. 2011 Sep;
34(5):1131-6.
PMID: 21932356
Purpose: To evaluate whether perfusion fraction (PF) calculated with diffusion-weighted magnetic resonance imaging (MRI) predicts the presence of blood supply in ovarian masses. Materials And Methods: PFs of 92 ovarian...
6.
Morita S, Kojima S, Hirata M, Suzuki M, Suzuki K, Masukawa A, et al.
J Magn Reson Imaging
. 2011 Jun;
34(1):157-64.
PMID: 21698709
Purpose: To compare the image qualities of unenhanced electrocardiographically (ECG)-gated fast spin-echo magnetic resonance digital subtraction angiography (MRDSA) using a short echo-spacing three-dimensional (3D) sequence, known as sampling perfection with...
7.
Machida H, Nunoda S, Okajima K, Shitakura K, Sekikawa A, Kubo Y, et al.
Int J Cardiovasc Imaging
. 2011 Mar;
28(3):555-62.
PMID: 21442262
Cardiac allograft vasculopathy (CAV) is a major late complication in heart transplant recipients, graded based on intravascular ultrasound (IVUS), and accelerates left ventricular (LV) diastolic dysfunction. We investigated the clinical...
8.
Morita S, Masukawa A, Suzuki K, Hirata M, Kojima S, Ueno E
Radiographics
. 2011 Mar;
31(2):E13-33.
PMID: 21415179
Alongside the two conventional unenhanced magnetic resonance (MR) angiographic techniques, namely time-of-flight and phase-contrast MR angiography, several novel techniques have since been developed, including electrocardiograph (ECG)-gated fast spin echo (FSE),...
9.
Kojima S, Morita S, Ueno E, Hirata M, Shinohara H, Komori A
J Magn Reson Imaging
. 2011 Jan;
33(2):432-40.
PMID: 21274986
Purpose: To elucidate the causes of aliasing artifacts with the BLADE technique and clarify the effective suppression methods. Materials And Methods: We separately observed the aliasing artifacts of BLADE from...
10.
Machida H, Komori Y, Ueno E, Shen Y, Hirata M, Kojima S, et al.
Jpn J Radiol
. 2010 Oct;
28(8):571-7.
PMID: 20972856
Purpose: We compared the accuracy of magnetic resonance imaging (MRI) measurements of pulsatile flow velocity in a small tube phantom using different spatial factors versus those obtained by intraluminal Doppler...