B. Statistical Results

1. Attenuation Coefficients

   The table below was derived from the average warped AC images for all 167 patients above:

   	Avg. AC (cm-1)	S.D. (model)	Min	Max	S.D. (inter-patient)
   Tissue	0.084	0.012 (14%)	0.026	0.103	0.006 (7%)
   Lung	0.045	0.008 (18%)	0.019	0.067	0.008 (18%)

   Key:

   Avg. AC - The average AC in the tissue/lung region
   S.D. (model) - The average standard deviation of the tissue/lung AC
   Min - The minimum AC in the tissue/lung region
   Max - The maximum AC in the tissue/lung region
   S.D. (inter-patient) - The average standard deviation across patients
   

2. Body Shapes and Sizes

   The table below summarizes the averages of some of the body dimension measures taken from the database.

   	Weight (lbs)	Horizontal (cm)	Vertical (cm)	Lung Volume (cm3)
   167 Patients	163	34.6	24.6	1672
   82 Females	151	34.3	23.4	1528
   85 Males	173	34.8	25.7	1811

   Key:

   Weight - The average weight
   Horizontal - The average horizontal axis dimension of the body
   Vertical - The average vertical axis dimension of the body
   Lung Vol - The average lung volume (found by counting thresholded voxels)
   

3. LV Sizes and Positions

   The data in this table were derived from the processing information of the patients' resting Rb-82 scans.

   	Z-Angle (degrees)	X-Angle (degrees)	Length (cm)	Radius (cm)	Volume (cm3)	Stress Shift (xyz mm)
   167 Patients	-38	24	7.9	2.5	228	-2.1,-2.2,6.4
   82 Females	-40	26	7.5	2.4	202	-2.2,-2.7,7.0
   85 Males	-36	22	8.3	2.6	253	-2.1,-1.8,5.8

   Key:

   Z-Angle - The average angle of the LV axis from vertical in the transaxial view
   X-Angle - The average angle of the LV axis from horizontal in the sagital view
   Length - The average length of the LV (from operator selected apex/base limits)
   Radius - The average mid-ventricular LV radius (from the circumferential profiles)
   Volume - The average LV volume (from the circumferential profiles)
   Stress Shift - The average change in the LV position (x, y, and z) from rest to stress
   

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