RANZCR ASM 2010 / R-0108
CMRI Measurements and Ranges of the Normal Adult Thoracic Aorta and Main Pulmonary Artery.
This poster was originally presented at the RANZCR Annual Scientific Meeting 2010, October 14-17, in Perth/AU.
Congress:
RANZCR ASM 2010
Keywords:
Cardiac, Arteries / Aorta, Pulmonary vessels, MR
Authors:
A.-A. Mohamed, R. Slaughter, V. Rodriguez, W. Strugnell, H. Bartlett; QLD/AU
DOI:
10.1594/ranzcr2010/R-0108
Methods and Materials
Participants
- 49 normal adult volunteers
- Males = 23 (mean age 32,
range 22 to 60 years)
- Females = 26 (mean age 33,
range 22 to 55 years)
Technique
- Breath hold 2D ECG gated SSFP images of the thoracic aorta were obtained in a sagittal oblique view; perpendicular to the ascending aorta at the level of the aortic sinuses; and of the LVOT.
(Sidebar Figures 4-6).
- 3D sagittal oblique images of the thoracic aorta were obtained using a free breathing navigator assisted ECG gated SSFP technique.
(Sidebar Figures 7-8).
- Sagittal and coronal oblique 2D ECG gated SSFP images of the main pulmonary artery were obtained.
(Sidebar Figure 9).
- All imaging was obtained using a 1.5 T GE Healthcare Signa Twinspeed system.
Examiners and measurements
- Two independent examiners blinded to each others readings made measurements of the thoracic aorta and main pulmonary artery at set positions.
- The maximum arterial diameter at set points were measured.
Statistical analysis
- Agreement between examiners was assessed for all measurements using intra-class correlation coefficients,
where a coefficient of “0” is no agreement and “1” is perfect agreement between examiners.
- Bland-Altman plots were used to determine:
- Similarity of measurements using 2D and 3D techniques.
- T-test and p values were obtained to determine if the difference between techniques was statistically significant.
- A mean and standard deviation of the average vascular diameter for 2D and 3D techniques at all regions were calculated.