ECG-synchronized helical imaging or helical CT scan

Helical imaging was introduced in the late 1980's to increase the image acquisition time, particularly in body imaging.

https://www.upstate.edu/radiology/education/rsna/ct/geometry...

Methods: Intravenously contrast enhanced MSCT coronary angiography was done during a single breath hold, and ECG synchronised images were reconstructed retrospectively.

https://go.gale.com/ps/anonymous?id=GALE|A94207090&sid=googl...

Helical CAT scan: Helical computed axial tomography scan (CAT scan or CT scan) is another name for a CT scan, and is also called a spiral CT scan. Until approximately the mid to late 1990's, CT images were obtained one slice at a time, with the patient table moving step by step through the gantry. Scans obtained using this older technique often required 30 or 45 minutes, and the patient held his or her breath for every slice. Helical or spiral CT scans are obtained usually with one breath hold and obtain a volume of X-rayed tissue while the table moves rapidly through the gantry.

https://www.medicinenet.com/helical_cat_scan/definition.htm

Recent technical advances in CT scanning dramatically increased its speed and effectiveness by a process called multi-slice or helical (spiral) scanning.

CT scan without contrast

https://imaging.cancer.gov/imaging_basics/cancer_imaging/ct_...

The following article is about veterinary but I wonder if this also could apply here?

This allows for the cardiac silhouette to be in the center of the image, giving a true representation of the cardiac size and shape.

https://todaysveterinarypractice.com/small-animal-thoracic-r...


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Note added at 23 hrs (2021-05-23 11:59:58 GMT)
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Acquisitions = images, imaging acquired via the CT scan. I hope it helps.