Combining low tube voltage and iterative reconstruction for contrast-enhanced CT imaging of the chest-initial clinical experience
| Autor: | Li Fan, Qing-Chu Li, Hong-Ming Yu, Shiyuan Liu, Lianfeng Zhang |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Male
medicine.medical_specialty Image quality Radiography Contrast Media Image processing Iterative reconstruction Signal-To-Noise Ratio Radiation Dosage Triiodobenzoic Acids medicine Image noise Image Processing Computer-Assisted Humans Radiology Nuclear Medicine and imaging Observer Variation Radon transform business.industry Low tube voltage General Medicine Middle Aged Radiographic Image Enhancement Radiographic Image Interpretation Computer-Assisted Female Radiography Thoracic Tomography Radiology Nuclear medicine business Tomography X-Ray Computed Algorithms |
| Zdroj: | Clinical radiology. 68(5) |
| ISSN: | 1365-229X |
| Popis: | Aim To evaluate the image quality of contrast-enhanced chest computed tomography (CT) with low tube voltage settings using an iterative reconstruction algorithm (iDose4) and standard dose filtered back projection (FBP) CT in patients with normal body mass index (BMI). Materials and methods Eighty patients with normal BMI were referred for a contrast-enhanced chest CT. Patients were randomly assigned into two groups: 120 kVp and 80 kVp. Standard convolution FBP was used to reconstruct the 120 kVp group (A) and 80 kVp group (C) image sets and iterative reconstruction (iDose4) was used to reconstruct the 80 kVp group (B) image sets. The mean image noise, signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR), and effective dose (ED) were calculated for each protocol. Image quality was graded (scale: 1–3) and compared among the three groups. Results The radiation dose was 71.35% less for the low-voltage protocol. Noise was significantly lower in the low-voltage images reconstructed with iDose4 (group B) compared with images reconstructed with FBP (group C). Group B had the highest SNR and CNR. There was no difference in subjective image quality scores between groups B and A ( p > 0.05). Conclusions Compared with standard FBP reconstruction, the iDose4 iterative reconstruction yields higher SNR, CNR, and better image quality in contrast-enhanced chest CT with low tube voltage settings. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect