Takanori Masuda, Abstract Co-Author: Nothing to Disclose

Yun Shen MD, PhD, Presenter: Nothing to Disclose

Naoyuki Imada, Abstract Co-Author: Nothing to Disclose

haoya maruyama, Abstract Co-Author: Nothing to Disclose

chiaki waki, Abstract Co-Author: Nothing to Disclose

Infants and Children with congenital heart disease have superior high heart rate which is one of the causes for motion artifacts of cardiac CT images and is one limitation of cardiac CT diagnosis. The purpose of this paper is to evaluate the limitation of cardiac CT on the superior high heartbeat using pulsating cardiac phantom and is to analyze pediatric cardiac cases.

Helical scan of pulsating cardiac phantom on the 50-150bpm (10bpm step) was performed using ECG gated 64row 40mm volume computed tomography (VCT) (GE LightSpeed VCT 64x0.625mm, 0.35s/r, reconstruction algorithm: cardiac half reconstruction (CHR) and multi sector recon (MSR)). The image quality of VR and MPR from different algorithm and different heartbeat was analyzed and compared in 5 point scorning (5: Excellent; 1: poor; 3: accepted diagnosis) by 5 MDs/RTs mean scoring values (MSV). 14 continue child patients were analyzed about age, weight and heartbeat information.

MSV of CHR and MSR on the all heartbeat is 2.79+/-1.49 (Max: 4.9, Min: 1) and 4.33+/-0.60 (Max: 5, Min: 3.3), respectively. MSV of MSR is larger than 3.0 (accepted diagnosis scoring) on the all heartbeat, and MSV of is large than 3.0 when heartbeat less 90bpm. The MSV on the all heartbeat were significantly different between CHR and MSR (p<0.01). 14 continue child patients were analyzed: age: 4.6+/-5.0 old year, weight: 17.4+/-12.7 kg; and heartbeat information: 100.5+/-23.0 bpm. The correlation coefficient between age and weight is 0.9364 (Y=2.4451X+6.0341), and the correlation coefficient between age and heartbeat is 0.7402 (Y=-3.9414X+118.74).

Our experimental and child patients analysis demonstrate that 64row 40mm VCT with 0.35s rotation speed and high temporal resolution multi-sector cardiac reconstruction algorithm can provide good image quality in the super-high heart rate child patient diagnosis.

This study give guideline for children congenital heart disease diagnosis with high heartbeat rate on the cardiac CT scan.

Masuda, T, Shen, Y, Imada, N, maruyama, h, waki, c, Useful of 64 Row (40mm) Volume Computed Tomography (VCT) for Pediatric Cardiac Diagnosis on the High Heartbeat: Pulsating Cardiac Phantom Experiment and Analysis of Pediatric Cardiac Cases.  Radiological Society of North America 2007 Scientific Assembly and Annual Meeting, November 25 - November 30, 2007 ,Chicago IL. http://archive.rsna.org/2007/5014488.html