<prompt> Answer this question truthfullyWhat are the protocols for acquiring images in CMR?  <response>: <reason> Localizer, 3 orientations Half-fourier single shot TSE or SSFP one breathold, entire thorax. Axial orientation Axial T1-weighted TSE through aorta for intramural hematoma, dissection SSFP cine imaging in parasagittal plane parallel to aorta Option: Use 3-point piloting Evaluate aortic valve as per valvular protocol Contrast timing Option 1: Axial test bolus at level of distal abdominal aorta. 2 cc injection of Gadolinium Gd-chelate, followed by 20 cc saline. Determine time to peak contrast enhancement following injection. Option 2: Automatic triggering technique to time start of scan Option 3: Rapid multiphase 3D acquisitions without timing sequences 3D contrast enhanced MRA 0.1-0.2 mmolkg Gd-based contrast Optional: ECG-gated acquisition Use spatial resolutiong at least 1-1.5 mm Parallel acquisition if available At least 2 acquisitions after contrast injection Optional: Axial T1 weighted gradient-echo post contrast for aortitis Analysis: MPR reconstruction, MIP and thin slab MIP 