Magnitude image CSPAMM reconstruction (MICSR)

NessAiver, Moriel; Prince, Jerry L.

doi:10.1002/mrm.10523

Cited by 29 publications

(31 citation statements)

References 17 publications

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“…Another repercussion of the relaxing effects of manganese is the faster tag fading. Indeed, even with the C-SPAMM technique, CNR evolution in magnitude tagged images is directly linked to the T 1 value, as extensively described by NessAiver & Prince (24). Indeed, in magnitude C-SPAMM images, image intensity becomes a Rician distribution.…”

Section: Discussionmentioning

confidence: 90%

Feasibility of complementary spatial modulation of magnetization tagging in the rat heart after manganese injection

et al. 2007

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It has been shown that manganese-enhanced MRI (MEMRI) can safely depict the myocardial area at risk in models of coronary occlusion-reperfusion for at least 2 h after reperfusion. To achieve this, a solution of MnCl(2) is injected during coronary occlusion. In this model, the regional function quantification deficit of the stunning phase cannot be assessed before contrast injection using MR tagging. The relaxation effects of manganese (which remains in normal cardiac myocytes for several hours) may alter the tags by increasing tag fading and hence the quality of strain measurement. Therefore, we evaluated the feasibility of cardiac MR tagging after manganese injection in normal rats. Six normal Sprague-Dawley rats were imaged in vivo using complementary spatial modulation of magnetization (C-SPAMM) at 1.5 T, before and 15 min after intraperitoneal injection of MnCl(2) solution (~17.5 micromol kg(-1)). The contrast-to-noise ratio of the tag pattern increased significantly (P < 0.001) after injection and remained comparable to the control scan in spite of the higher myocardial relaxation rate caused by the presence of manganese. The measurements of circumferential strain obtained from harmonic phase imaging analysis of the tagged images after MnCl(2) injection did not differ significantly from the measurements before injection in the endocardial, mid-wall, and epicardial regions. In particular, the transmural strain gradient was preserved. Thus, our study suggests that MR tagging could be used in combination with MEMRI to study the acute phase of coronary artery disease.

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Section: Discussionmentioning

confidence: 90%

Feasibility of complementary spatial modulation of magnetization tagging in the rat heart after manganese injection

et al. 2007

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“…The interpolated spatial resolution was 1. [9] images were reconstructed from these 4 sets of data. Our method was implemented in C, and compiled in Matlab 7 (Mathworks, Natick MA).…”

Section: Experiments Resultsmentioning

confidence: 99%

Harp Tracking Refinement Using Seeded Region Growing

Liu

Murano²,

Stone

et al. 2007

2007 4th IEEE International Symposium on Biomedical Imaging: From Nano to Macro

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Tagged magnetic resonance (MR) imaging makes it possible to image the motion of tissues such as the muscles found in the heart and tongue. The harmonic phase (HARP) method largely automates the process of tracking points within tagged MR images. It works by finding spatial points in successive images that retain the same two harmonic phase values throughout the entire image sequence. Given a set of tracked points, many interesting and useful motion properties such as regional displacement or rotation, elongation, strain, and twist, can be computed. When there is a large motion between successive image frames, HARP tracking can fail, and this results in mistracked points and erroneous motion estimates. In this paper, we present a novel HARP refinement method based on seeded region growing that addresses this problem. Starting from a given seed point which is determined by the user to be correctly tracked throughout the entire sequence, this method can reliably track the motion of the whole tissue. A novel cost function is used in the region growing to assure that points that can be most reliably tracked are tracked first. Experimental results on tagged MR images of the tongue demonstrate very reliable tracking.

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“…Also, to overcome the crowding, a narrower HARP filter may be required, thereby reducing the already limited spatial resolution. The second approach is the magnitude image CSPAMM reconstruction (MICSR) method (14). It can be shown that MICSR essentially uses the phase of the DC image to correct the phase of the CS-PAMM image.…”

Section: Discussionmentioning

confidence: 99%

Peak‐combination HARP: A method to correct for phase errors in HARP

Ryf

Tsao

Schwitter

et al. 2004

Magnetic Resonance Imaging

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Purpose: To introduce a method to correct phase errors (e.g., from B 0 inhomogeneity) in tagging images, which may affect harmonic phase (HARP) evaluation. Materials and Methods:The phase images corresponding to the negative and positive harmonic peaks in k-space are combined before HARP evaluation to eliminate any spurious phase. To validate in vivo, two complementary spatial modulation of magnetization (CSPAMM) data sets were collected for each volunteer and evaluated with conventional HARP, using either the positive or the negative harmonic peak, and with peak-combination HARP.Results: Elimination of phase distortion by peak combination was observed in vitro and in vivo. Improved reproducibility of motion parameters was found with peak-combination HARP. Conclusion:With peak-combination HARP, reproducibility of contractile parameters is improved, and consequently, the number of subjects needed to detect statistically significant changes in contractile function can be reduced to one third compared to conventional HARP evaluation.

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Magnitude image CSPAMM reconstruction (MICSR)

Cited by 29 publications

References 17 publications

Feasibility of complementary spatial modulation of magnetization tagging in the rat heart after manganese injection

Feasibility of complementary spatial modulation of magnetization tagging in the rat heart after manganese injection

Harp Tracking Refinement Using Seeded Region Growing

Peak‐combination HARP: A method to correct for phase errors in HARP

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