Purpose: The aim of this study is to compare SAFIRE with the current gold standard, Filtered Back Projection (FBP), and assess whether SAFIRE alone permits a reduction in dose while maintaining image quality in paediatric head CT.
Methods: Images were collected using a paediatric head phantom using a SIEMENS SOMATOM
PERSPECTIVE 128 modulated acquisition. 54 images were reconstructed using FBP and 5 different strengths of SAFIRE. Objective measures of image quality were determined by measuring SNR and CNR. Visual measures of image quality were determined by 17 observers with different radiographic experiences. Images were randomized and displayed using 2AFC; observers scored the images answering 5 questions using a Likert scale.
Results: At different dose levels, SAFIRE significantly increased SNR (up to 54%) in the acquired images compared to FBP at 80kVp (5.2-8.4), 110kVp (8.2-12.3), 130kVp (8.8-13.1). Visual image quality was higher with increasing SAFIRE strength. The highest image quality was scored with SAFIRE level 3
Conclusion: The SAFIRE algorithm is suitable for image noise reduction in paediatric head CT. Our data demonstrates that SAFIRE enhances SNR while reducing noise with a possible reduction of dose of 68%.
|Title of host publication||OPTIMAX 2014 – radiation dose and image quality optimisation in medical imaging|
|Place of Publication||Lisbon, Portugal|
|Publication status||Published - 2015|
|Event||OPTIMAX 2014: radiation dose and image quality optimisation in medical imaging - Lisbon , Portugal|
Duration: 1 Aug 2014 → 31 Aug 2014
|Period||1/08/14 → 31/08/14|
- filtered back projection
- sinogram-affirmed iterative
- dose reduction
- paediatric ct
- computed tomography
- image quality