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(Circulation. 1999;100:e61-e62.)
© 1999 American Heart Association, Inc.

Circulation Electronic Pages

Four-Dimensional Cardiac Image by Helical Computed Tomography

Yasushi Koyama, MD; Hiroshi Matsuoka, MD; Hiroshi Higasino, MD; Hideo Kawakami, MD; Katsuji Inoue, MD; Taketoshi Ito, MD; Masaya Doi, RT; Sigeru Nakata, RT; Teruhito Mochizuki, MD

From the Departments of Cardiology (Y.K., H.M., H.K., K.I., T.I), Radiology (H.H.), and Radiological Technology (M.D.), Ehime Prefectural Imabari Hospital; and the Department of Radiological Technology of Ehime University (S.N.) and the Department of Radiology, Ehime University School of Medicine (T.M.), Onsengun, Ehime, Japan.

Correspondence to Yasushi Koyama, MD, Cardiology, Ehime Prefectural Imabari Hospital, 794-0006, Imabari, Ehime, Japan. E-mail dyasusi@dokidoki.ne.jp

	Introduction

 
Ultrasound and MRI are useful in assessing wall motion and systolic thickening with 2D images. Volumetric data of the helical CT provide frozen 3D images. We sought to determine whether helical CT could assess left ventricular wall motion with 3D animation. We have developed a new cardiac application, ventriculography by 4D enhanced helical CT (4D-CT-VG), which can assess wall motion with 3D animation from any perspective. We demonstrate representative 4D-CT-VG in 3 patients with acute myocardial infarction. In all 3 patients, akinetic areas assessed by 4D-CT-VG were concordant with those evaluated by conventional left ventriculography (LVG) (Figure).

View larger version (68K): [in this window] [in a new window]   Figure 1. Conventional LVG and the corresponding 4D-CT-VG of 3 patients with acute myocardial infarction (A, broad anteroseptal wall; B, localized inferior wall; and C, inferolateral wall). Wall motion abnormalities (akinesis) in the infarct lesions evaluated by 4D-CT-VG were concordant with those observed by LVG (arrowheads). With 4D-CT-VG, observation of left ventricular wall motion is possible in any direction, interactively (postprocessing interactive manner). ED indicates end diastole; ES, end systole; RAO, right anterior oblique; and LAO, left anterior oblique.

	Method of 4D-CT-VG

 
At 50 seconds from the beginning of intravenous administration of a contrast medium (1.5 mL/s, total dose 100 mL), the scan was started and covered the patient's entire heart during a single breath-hold, by use of an ECG-gating technique. Scan parameters used were 3-mm-thick collimation, 3-mm per rotation table speed, 0.8 second per rotation, and 40 rotations (32 seconds) through 12 cm in total. The helical CT scanner was a ProSeed-SA (GE Yokogawa . . . [Full Text of this Article]

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