Table 1—

Regional classification of panacinar# rat lungs in terms of morphometric and magnetic resonance imaging parameters

RatLower right lobeUpper right lobeLeft lung
10−2AIAADC10−2AIAADC10−2AIAADC
µm2Classcm2·s−1Classµm2Classcm2·s−1Classµm2Classcm2·s−1Class
Control87±3810.15±0.01177±2810.15±0.01184±3910.16±0.011
e.1314±5030.17±0.042302±5630.18±0.053300±2930.19±0.043
e.2271±6730.16±0.022233±5830.17±0.022312±8730.18±0.032
e.3244±2730.21±0.053255±3030.19±0.063234±5630.19±0.053
e.4160±4520.17±0.062110±2410.15±0.05174±1810.15±0.031
e.5105±2910.16±0.03295±2010.16±0.02282±2210.17±0.022
e.6188±6120.18±0.062171±5120.18±0.062164±2020.16±0.041
e.7239±10330.19±0.043343±9230.17±0.042124±1610.20±0.043
e.8325±6730.17±0.052322±5430.21±0.093207±8130.15±0.041
  • Data are presented as mean±sd

  • Spatial selection was based on rat lung structure. For the control, intersubject data are given since there is very little difference among these data

  • AIA: alveolar internal area

  • ADC: apparent diffusion coefficient

  • #: codes (e.1, e.2, etc.) are as in figure 1

  • : intrasubject mean AIAs are divided into three classes as suggested by the values observed: 1: 7,000≤AIA<15,000; 2: 15,000≤AIA<20,000; and 3: >20,000 µm2. Similarly intrasubject ADCs are divided into: 1: 0.14≤ADC<0.16; 2: 0.16≤ADC<0.18; and 3: >0.18 cm2·s−1