The influence of through-plane motion on left ventricular volumes measuredby magnetic resonance imaging: Implications for image acquisition and analysis
Jt. Marcus et al., The influence of through-plane motion on left ventricular volumes measuredby magnetic resonance imaging: Implications for image acquisition and analysis, J CARD M RE, 1(1), 1999, pp. 1-6
In rite evaluation of the left vertricular (LV) function using magnetic res
onance imaging (MRI), a stack of parallel short-axis (SA) cine images is ac
quired that covers the whole LV. The aim of this study is to quantify the c
ontribution to the LV volume parameters, provided by the most basal image p
lane that shows the LV wall only in end diastole (ED) but not in end systol
e (ES). In 57 healthy volunteers (31 men, mean body surface area 1.87 m(2))
, a complete set of parallel SA images was acquired (10-mm slice distance)
by breathhold segmented k-space cine MRI (7 k(y) lines per beat). The LV en
d-diastolic volume (EDV), stroke volume (SV), ejection fraction (EF), and c
ardiac output (CO) were determined by slice summation. Calculations were pe
rformed both with and without inclusion of the most basal slice. With inclu
sion of the most basal slice, all parameters were significantly (p < 0.001)
larger compared with the values obtained by excluding this slice. EDV was
134 +/- 29 ml versus 113 +/- 26 ml: SV was 93 +/- 18 ml versus 72 +/- 16 ml
, EF was 70 +/- 4% versus 64 +/- 4%; and CO was 5.3 +/- 1.4 l/min versus 4.
1 +/- 1.1 l/min. The inclusion of the most basal slice leads to significant
ly larger values of LV volume parameters. Thus, this most basal SA image sl
ice should be included in calculating the EDV. Whether or not this basal SA
slice also contributes to the ES volume should be decided by using anatomi
cal criteria on the ES image. The projection line onto the ES image of a lo
ng-axis view provides an additional criterion.