| US 7,542,544 B2 | ||
| Ultrasound gating of cardiac CT scans | ||
| Jonathan M. Rubin, Ann Arbor, Mich. (US); Jeffrey Brian Fowlkes, Ann Arbor, Mich. (US); Charles R. Meyer, Ann Arbor, Mich. (US); and Srini Tridandapani, Saline, Mich. (US) | ||
| Assigned to The Regents of the University of Michigan, Ann Arbor, Mich. (US) | ||
| Filed on Jan. 05, 2005, as Appl. No. 11/29,773. | ||
| Claims priority of provisional application 60/534583, filed on Jan. 06, 2004. | ||
| Prior Publication US 2005/0177044 A1, Aug. 11, 2005 | ||
| Int. Cl. G01N 23/04 (2006.01); A61B 6/00 (2006.01); A61B 5/05 (2006.01) | ||
| U.S. Cl. 378—62 [378/8; 600/428] | 17 Claims |
| 1. A method for performing a cardiac gated image acquisition with an imaging system, the steps comprising:
a) performing a prescan on a subject in which a gating window is determined by:
i) producing a bioelectromagnetic signal indicative of the subject's cardiac cycle;
ii) acquiring, responsive to the produced bioelectromagnetic signal, ultrasonic echo signals from the subject at a succession
of time slices during a cardiac cycle;
iii) calculating the similarity of echo signals acquired at selected time slices with the echo signals acquired at other time
slices;
iv) selecting a succession of time slices having similarity values above a threshold value as a gating window; and
b) acquiring image data from the subject by:
i) producing a bioelectromagnetic signal indicative of the subject's cardiac cycle;
ii) begin acquiring image data with the imaging system, in response to the produced bioelectromagnetic signal, at the time
during the cardiac cycle corresponding to the start of the gating window; and
iii) stop acquiring image data at the time corresponding to the end of the gating window.
|