Electronic Posters: Cardiovascular

Tuesday 13:30-15:30 Computer 34

13:30 3652. Free-Breathing Delayed-Enhancement 3D MRI with and Without Phase-Sensitive Inversion-Recovery

Yasuo Amano¹, Masaki Tachi¹, Yoshio Matsumura¹, Yuriko Suzuki², Shinichiro Kumita¹, Yasutomo Katsumata<sup>2

1</sup>Radiology, Nippon Medical School, Tokyo, Japan; ²Philips Electronics Japan, Tokyo, Japan

This study demonstrated that phase-sensitive inversion-recovery technique was feasible for free-breathing 3D delayed-enhancement MRI at 3.0T, because it significantly improved the confidence for the presence of the hyperenhancing myocardium and the image contrast between the myocardium and blood. However, the 3D MRI without PSIR could not be omitted in some patients, because of its fewer image artifacts and no deterioration of the image quality.

14:00 3653. Clinical Evaluation of a Cardiac T1 Mapping Method Using a Reduced Number of Sample Times

Ting Song^1,2, Vincent B. Ho^2,3, Glenn Slavin¹, Maureen N. Hood^2,3, Jeffrey A. Stainsby<sup>4

1</sup>GE Healthcare Applied Science Laboratory, Bethesda, MD, United States; ²Radiology, Uniformed Services University of the Health Sciences, Bethesda, MD, United States; ³Radiology, National Navy Medical Center, Bethesda, MD, United States; ⁴GE Healthcare Applied Science Laboratory, Toronto, ON, Canada

A Modified Look-Locker with saturation recovery sequence was evaluated on nine patients using different data sampling schemes. The proposed sequence enables flexibility in sampling schemes and an approach comparing a typical 16 heartbeat data acquisition with 8 samples of the signal recovery is compared to an approach that samples only 4 points during the signal recovery in 8 heartbeats. T1 values in normal myocardial tissue pre- and post-contrast, and infarcted myocardial tissue post-contrast, are measured and quantified on patients and volunteers. Accurate T1 estimates can be obtained using reduced data sampling.

14:30 3654. Quantitative Detection of Myocardial Edema Using a Breath-Hold T2 Mapping Pulse Sequence

Mansi Shah¹, Monvadi B. Srichai^2,3, Robert Donnino³, Daniel Kim<sup>2

1</sup>New York University School of Medicine, New York, NY, United States; ²Radiology, New York University School of Medicine, New York, NY, United States; ³Medicine, New York University School of Medicine, New York, NY, United States

Clinical evaluation of myocardial edema with conventional T2-weighted imaging is challenging because of non-uniform signal intensities associated with surface coil. We propose to quantitatively detect myocardial edema using a breath-hold T2 mapping pulse sequence. The accuracy of the T2 mapping pulse sequence was validated against qualitative T2-weighted imaging in seven patients with clinical evidence of heart disease. The T2 mapping pulse sequence was correlated against delayed contrast-enhanced imaging in a patient with acute myocardial infarction. Future research include comprehensive evaluation of T2 values with specific cardiac conditions and the clinical utility of T2 mapping for assessment of myocardial edema

15:00 3655. Triple Inversion Recovery Imaging of Myocardial Infarction

Larry Kramer¹, Catalin Loghin², Eduardo Matta, Martin Pilat, Naveen Garg, Khader Hasan

¹Diagnostic Imaging, UTHSC-Houston, Houston, TX, United States; ²Cardiology, UTHSC-Houston

Triple Inversion Recovery Imaging of the ventricular myocardium is sensitive to myocardial edema due to injury from a severe vascular event. Transmural myocardial infarcts were accurately identified relative to delayed contrast enhancement in 81% of positive cases of myocardial edema. The absence of edema in a patient with initial symptoms of chest pain and a positive electrocardiogram or coronary catheterization suggests a favorable functional outcome.