|
KMID : 1149020190210010001
|
|
Journal of Korean Society of Computed Tomographic Technology
2019 Volume.21 No. 1 p.1 ~ p.9
|
|
|
Optimization of Radiation Dose and Image Quality using ADMIRE Algorithm and Quantitative Evaluation
|
|
Son Bum-Gu
Lee Ki-Baek
Yoon Hee-Seok
|
|
|
Abstract
|
|
|
Purpose: The ADMIRE algorithm which is the latest iterative reconstruction (IR) was quantitatively evaluated depending on the type of substances, scan parameter, and the stages of application to optimize patient exposure dose and image quality.
Material and method: The four different types of substances; A(30~40 HU), B(60~70 HU), C(100~110 HU), and D(200~210 HU), were manufactured by using mixture of water and contrast medium and injected into the hole of the low contrast measuring part of AAPM phantom. The signal to noise ratio (SNR) and contrast to noise ratio (CNR) were quantitatively evaluated with CT numbers depending on the two types of tube voltage(100, 120 kVp), the five types of tube current by reducing the dose to 50 mAs(250, 200, 150, 100, 50 mAs), and the five types of algorithms (FBP, 1 to 5 steps in ADMIRE).
Result: There were no significant differences of CT number (HU) among images depending on the application phase of FBP and ADMIRE algorithms(p>0.05); however, HUs with 100 kVp were increased up to 23±2% compared to 120 kVp(p<0.05). SNR was increased by 10%, 23%, 38%, 60%, and 98% when ADMIRE algorithms were applied sequentially to steps 1 to 5. Also, CNR was increased by 10%, 22%, 36%, 58%, and 97% in the same ADMIRE algorithm condition. Equal quality of filtered back projection (FBP) image taken with 120 kVp and 200 mAs, was maintained by applying more than 1, 3, and 5 strengths of ADMIRE in case of 150 mAs(75%), 100 mAs(50%), and 50 mAs(25%) patient dose reduction.
Conclusion: ADMIRE can reduce patient dose up to 75% without degradation of image quality. In addition, the application of ADMIRE more than 3 strengths are required if the patient dose reduced by more than 50%.
|
|
|
KEYWORD
|
|
|
ADMIRE, Iterative Reconstruction, Patients dose reduction
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
|
|
|