Liver detection algorithm: its efficacy for CT noise reduction in the liver.
OBJECTIVES
This study was performed to evaluate the efficacy of a novel computed tomography (CT) liver detection algorithm (LDA), which allows for targeted increase of radiation dose to the upper abdomen, on image quality of the liver.


METHODS
We retrospectively evaluated the LDA by comparing 40 consecutive patients who had portal venous CT abdomen performed without use of the algorithm, to 40 patients in whom the algorithm was used. Image quality was assessed objectively by comparing the standard deviation (SD) of attenuation values in Hounsfield units (HU) of the abdominal organs. Qualitative analysis was performed by two blinded radiologists who independently graded the image quality of abdominal organs


RESULTS
There was significant noise reduction in the liver (P < 0.001) and spleen (P < 0.001) in the LDA group compared to the conventional group. There was also a significant improvement in image quality of the liver (P < 0.001), kidney (P < 0.001), spleen (P < 0.001), pancreas (P < 0.001), and psoas (P = 0.005) in the LDA group compared to the conventional group. Overall dose between the two groups was similar.


CONCLUSIONS
This liver detection algorithm improves the subjective image quality of upper abdominal organs, in particular the liver, without increasing overall radiation dose.
['Devapalasundaram|Ashwini|A|', 'Lau|Kenneth K|KK|', 'Paul|Eldho|E|', 'Mak|Larry|L|', 'Ardley|Nicholas|N|', 'Buchan|Kevin|K|', 'Kuganesan|Ahilan|A|']
D000465:Algorithms D005260:Female D006801:Humans D008099:Liver D008297:Male D008875:Middle Aged D011829:Radiation Dosage D011856:Radiographic Image Enhancement D011857:Radiographic Image Interpretation, Computer-Assisted D015203:Reproducibility of Results D012189:Retrospective Studies D059629:Signal-To-Noise Ratio D014057:Tomography, X-Ray Computed
Liver Algorithm Image quality Dosage Multidetector computed tomography