title: [Clinical usefulness of low tube current scanning with full reconstruction and automatic patient motion correction (APMC) reconstruction in a prospective ECG-gated coronary CT angiography using 320-row area detector CT].
abstract: OBJECTIVE
  The purpose of this study is to validate the clinical usefulness of Advanced Patient Motion Correction (APMC) reconstruction when motion artifacts were observed in a prospective ECG-gated coronary CT angiography (CCTA), which was acquired by low tube current scanning with full reconstruction using 320-row area detector CT (0.275 s/rot.).
  
  
  METHODS
  Of 530 consecutive CCTA, we selected 119 patients (M/F: 71/48, Age: 69 ± 11 y, BMI: 23.5 ± 2.5) with (RR-PQ) ≥ 968 ms before scanning, and performed a CCTA with low tube current scanning [30% of usual tube current (30%mA)], adaptive iterative dose reduction 3D, and full reconstruction. Image quality for motion artifacts was subjectively evaluated using a 3-point scale (excellent, acceptable, and unacceptable).
  
  
  RESULTS
  Of 119, 102 CCTA had "excellent" images (group A) and 17 had "acceptable" images (group B). The APMC and half reconstruction were retried in the 17 CCTA with "acceptable" images. Finally, all CCTA became "excellent" images. The RR-PQ of group B during scanning (966 ± 80 ms) was significantly (P = 0.0001) shorter than group A (1,088 ± 123 ms). Each image noise (standard deviation of CT value) of aorta, left atrium, and left ventricle was 21.7 ± 2.3, 24.7 ± 2.3, 24.5 ± 2.4 in full, 25.7 ± 2.2, 29.0 ± 3.4, 28.2 ± 2.7 in APMC, and 30.4 ± 2.8, 34.3 ± 4.2, 33.3 ± 2.9 HU in half reconstruction. Mean dose-length product of all patients was 66.2 ± 34.4 mGy · cm.
  
  
  CONCLUSIONS
  "Excellent" CCTA images can be obtained in 85.7% of patients with (RR-PQ)≥ 968 ms by full reconstruction. APMC is useful for motion artifacts and image noise reduction when patient' s HR increases during scanning rather than half reconstruction.
authors: Department of Radiological Technology, Takase Clinic.
authors: Tomoya
authors: T
authors: Takayanagi
authors: Tomonari
authors: T
authors: Sano
authors: Takeshi
authors: T
authors: Kondo
authors: Makoto
authors: M
authors: Amanuma
authors: Kazumasa
authors: K
authors: Ishizaka
authors: Takako
authors: T
authors: Sekine
authors: Hideyuki
authors: H
authors: Matsutani
authors: Hitomi
authors: H
authors: Morita
authors: Takehiro
authors: T
authors: Arai
authors: Shinichi
authors: S
authors: Takase
mesh_terms: D000368:Aged; D016477:Artifacts; D017023:Coronary Angiography / Q000295:instrumentation / Q000379:methods*; D004562:Electrocardiography; D005260:Female; D006801:Humans; D008297:Male; D009038:Motion; D014057:Tomography, X-Ray Computed / Q000295:instrumentation / Q000379:methods*