<prompt> During cardiac imaging the phase of minimum motion of hea is:Late systoleMid systoleLate diastoleMid diastole  <response>: D i.e. Mid diastole- During cardiac imaging such as MRI, CT, electron beam tomography, mid diastolic phase or diastasis of cardiac cycle is usually but not always associated with lowest minimum mean motion of hea.Q- Optimum phase i.e. with minimum cardiac motion for cardiac and coronary vessel imaging is mid-diastole diastasis at low or intermediate hea rates; but is variable and may occur in late systole at high hea rates.Cardiac Motion and Imaging- Radiological imaging by CT and MRI can detect coronary aery disease in early stage. However, the use of these tools to cardiac imaging is severely limited because of motion aifacts produced by constantly in motion hea completing an entire cycle of contraction and relaxation in about 1 second.- So radiological cardiac imaging requires a window of minimum cardiac motion to reduce motion aifacts and achieve meaningful images. The phase of minimum cardiac motion is although variable and depends on several factors especially hea rate and the chamber i.e. right left - atrium or ventricle to be specifically imaged. However, the phase of minimum cardiac motion optimum phase for cardiac coronary vessel imaging. 