Optimization of Helical Pitch in Cardiac MDCT Acquisition in Patients with Arrhythmia Requiring ECG-edit
-
- Matsutani Hideyuki
- Department of Radiology, Takase Clinic
-
- Sano Tomonari
- Department of Radiology, Takase Clinic
-
- Kondo Takeshi
- Department of Cardiology, Takase Clinic
-
- Sekine Takako
- Department of Radiology, Takase Clinic
-
- Arai Takehiro
- Department of Radiology, Takase Clinic
-
- Morita Hitomi
- Department of Radiology, Takase Clinic
-
- Takase Shinichi
- Department of Cardiology, Takase Clinic
Bibliographic Information
- Other Title
-
- ECG-editの必要な不整脈例の心臓MDCT撮影におけるヘリカルピッチ(HP)の最適化
- ECG-editの必要な不整脈例の心臓MDCT撮影におけるヘリカルビッチ(HP)の最適化
- ECG edit ノ ヒツヨウナ フセイミャクレイ ノ シンゾウ MDCT サツエイ ニ オケル エ リカルビッチ HP ノ サイテキカ
Search this article
Abstract
The ECG-edit is necessary in cardiac MDCT in arrhythmias [premature atrial contraction (PAC) or premature ventricular contraction (PVC)]; however, it sometimes results in a data deficit. Therefore, a thinner helical pitch (HP) should be set to avoid data deficits. The thinner helical pitch creates more radiation exposure. The purpose is to optimize HP in PAC or PVC. In a phantom study, an acrylic phantom (10×10×500 mm) was scanned by MDCT (Aquilion 64) using an artificial pacemaker at various gantry rotation speeds (r) and HP. We evaluated the relationships between HP and the maximal table moving length (Lmax) in the border of data deficit, and among r, HP, and the maximum data collection time interval (Tmax). In the clinical study, cardiac MDCT was performed in 44 cases (M/F: 26/18, 71.4±10.6yrs) including 30 PAC and 14 PVC using the optimal HP derived from Tmax+10%. In the phantom study, there were significant correlations between HP and Lmax (Lmax=34.94–0.32 HP... (1), r=0.999, P<0.0001), and Tmax [Tmax= (69.88/HP–0.64)×r] was calculated using formula (1). In 42/44 patients, high-quality images were obtained using the optimal HP; however, it resulted in data deficits in 2 patients, because of heart rate decreasing and a couple of PAC during scanning. Optimal HP significantly (P<0.0001) reduced radiation dose (–11.4%) compared with conventional HP. In conclusion, the optimal HP in PAC or PVC was calculated from the phantom study, provided fine images in 95% patients, and could reduce radiation dose.
Journal
-
- Japanese Journal of Radiological Technology
-
Japanese Journal of Radiological Technology 64 (11), 1343-1351, 2008
Japanese Society of Radiological Technology
- Tweet
Keywords
Details 詳細情報について
-
- CRID
- 1390001206363311104
-
- NII Article ID
- 110006990467
-
- NII Book ID
- AN00197784
-
- COI
- 1:STN:280:DC%2BD1cjptV2rtQ%3D%3D
-
- ISSN
- 18814883
- 03694305
-
- NDL BIB ID
- 9727519
-
- PubMed
- 19060428
-
- Text Lang
- ja
-
- Data Source
-
- JaLC
- NDL
- Crossref
- PubMed
- CiNii Articles
-
- Abstract License Flag
- Disallowed