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Two- and Three-Dimensional CT Ventriculography

A New Application of Helical CT

¹ Department of Radiology, Ehime University School of Medicine, Shitsukawa, Shigenobu-cho, Onsen-gun, Ehime 791-0295 Japan.
² Department of Radiology, Ehime-Imabari Hospital, 4-5-5, Ishii-cho, Imabari-city, Ehime 794-0006 Japan.
³ Department of Cardiology, Ehime-Imabari Hospital, Imabari-city, Ehime 794-0006 Japan.

View larger version (56K): [in a new window]   Fig. 1. —Drawing shows different cardiac cycles using 10 slices per rotation overlapping reconstruction (491 axial slices from 50 rotations). When slice center was on R wave or nearest R wave, slice was defined as end-diastolic phase. All end-diastolic (ED) phase slices were collected to produce an ED phase data set. All [ED + 1] phase slices were collected to produce [ED + 1] phase set data set. Other phase data sets were created in same manner. Note conventional 360° reconstruction and 180° helical reconstruction algorithms. Framing number of R-R interval was generated as mean R-R interval (msec) / 80 (msec) and rounded to integers. Also note methods to deal with beat-to-beat variability. FWHM = full width at half maximum (time resolution to obtain one axial slice).

View larger version (53K): [in a new window]   Fig. 2. —Graph shows mean CT attenuation (H) in left ventricular cavity (LV-CAVITY) and septal wall (WALL) at upper fourth, mid ventricle, and lower fourth levels (mean ± SD, not significant [ns] among three levels).

View larger version (64K): [in a new window]   Fig. 3. —65-year-old man with normal coronary arteries. A, CT ventriculogram in end-diastolic phase. Upper row shows two-dimensional images in axial (a), vertical long axial (b), horizontal long axial (c), and short axial (d) tomograms. Lower row shows three-dimensional (3D) surface (e, f) and 3D maximum-intensity-projection (g, h) images.

View larger version (62K): [in a new window]   Fig. 3. —65-year-old man with normal coronary arteries. B, CT ventriculogram in end-systolic phase corresponding to A.

View larger version (16K): [in a new window]   Fig. 4. —Scatter diagram shows correlations of end-diastolic volume (EDV, open circles) and end-systolic volume (ESV, closed circles) between CT ventriculography (CT) and left ventriculography (LVG) with line of equality.

View larger version (14K): [in a new window]   Fig. 5. —Scatter diagram shows correlation of left ventricular ejection fraction (LVEF), CT ventriculography (CT), and left ventriculography (LVG) with line of equality.

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