Shape distortions:

0. Use the resolution phantom.

1. Take a scan with a relatively low bandwith (2 kHz) axially through the mid-portion of the phantom using gradient echo scanning. Use a 128*256 matrix.
   
   
2. Do this once with the goggles out of the field and once with the goggles set up to be within the scan plane.
   
   
3. Use 'Mathalyze' to look for shape changes. You will have to run imconvert to make these into bfloat's...
   

Noise Tests:

0. Imaging: Acquire a typical real-world low-SNR scan (e.g., Ralph's quick scout) on a phantom with and without the goggles turned on (but in place, in both cases).
   
   
1. Echo-planar imaging. Collect a series of 100 "functional" images, with a TR of 500 msec, and a 128*128 matrix. Use the P2P stability analysis tool to look for spikes or other problems.
   
   
2. Just plain noise. Acquire a scan series of 100 images with the RF turned off and disconnected, with and without the goggles turned on (but always in place). Set the gain very high (r1=6 and r2=26) prior to scanning. Use 'stdev' to analyze the image series, comparing the noise levels in the two series.
   

   Be sure to reconnect the RF power after you complete this test!