Cover each stick in a spiral fashion.
A recent study of 100 patients comparing prospective ECG-gating with step-and-shoot technology to prospective ECG-gating with a high pitch spiral mode (pitch 3.4) demonstrated diagnostic image quality in over 98% of coronary artery segments with no significant difference in image quality between the two methods [56].
Depending on the CT machine and CT generation, the data should be acquired by using a retrospectively electrocardiography (ECG -gated spiral modECG -gated a prospiralvely ECG-gated protocol (also known as sequential or step-and-shoot mode) [3, 16] 14], or a prospectively ECG-gated sprotocolquisition with high-pitch [17, 18, 19].
On the following day, patients were vacuum immobilized in the supine position, and computed tomographic (CT) images were taken in spiral mode with a 2 mm slice thickness at maximum expiration.
Reconstructions of data acquired in the retrospective spiral mode can be performed either using a fraction of the R-R interval or an absolute time-point prior to or following the R-wave of each cardiac cycle, the latter showing some advantages in case of variable heart rates and arrhythmia.
A continuous low-dose CT scan was acquired in spiral mode using 120 kV, 170 mAs, slice thickness 2 mm, and pitch 0.8.
Prospectively ECG-gated high-pitch mode, acquiring the data in spiral mode while the table is moved at a high pitch of 3.4 at most.
Scanning data were obtained in spiral mode, with 16 detector rows, 0.75-mm section thickness, and a pitch of 1.5.
And when Dakota, in full spiral mode, follows her boyfriend's throwaway suggestion, heading off to place her neck on the train tracks, the author could at least make it interesting and have the 9 15 show up.
