Table 2 Measurements related to respiratory motion. Mean and standard deviation are reported.

From: Extending Cardiac Functional Assessment with Respiratory-Resolved 3D Cine MRI

  Respiratory Rate (brpm) Respiratory Depth (mm) Heart Rate (bpm) Data Portion (%) Average Motion (mm) Data Ratio (EE to EI)
All (N = 15) 14.5 ± 4.7 5.3 ± 2.3 65.4 ± 8.4    1.6 ± 0.5
  EE    64.0 ± 8.5 31.8 ± 9.8* 1.9 ± 1.3  
  EI    67.2 ± 8.1 20.7 ± 5.3* 2.8 ± 2.5  
Females (n = 7) 16.5 ± 5.4 6.0 ± 2.9 66.7 ± 10.1    1.4 ± 0.5
  EE    64.7 ± 10.4 25.6 ± 4.8** 1.6 ± 0.8  
  EI    68.4 ± 9.5 19.8 ± 5.9 2.1 ± 0.7  
Males (n = 8) 12.8 ± 3.1 4.7 ± 1.4 64.3 ± 6.3    1.8 ± 0.5
  EE    63.4 ± 6.3 37.2 ± 9.8** 2.2 ± 1.5  
  EI    66.0 ± 6.5 21.5 ± 4.6 3.4 ± 3.2  
  1. The differences of the paired measurements between two respiratory phases are not significant except those highlighted with *(p = 0.001 calculated using t-test), and the significant differences between two genders are highlighted with **(p = 0.03 calculated using Mann-Whitney test), based on significance level of 0.05.
  2. EE: end-expiration; EI: end-inspiration; Respiratory Depth: the three-dimensional displacement (Δd) of the heart between EE to EI; Data Portion: the percentage of the data from the entire respiratory cycle that occurs in EE or EI; Average Motion: the averaged distance of the clustered data points from the center of the cluster in EE or EI; Data Ratio (EE to EI): the ratio between the data portions (by counts of heartbeats) at EE and EI; brpm: breaths per minute; bpm: beats per minute.