Ces radiol. 2012, 66(1):18-22

The first experience with a hybrid iterative reconstruction technique iDose in brain CT imaging in children, adolescents and adultsOriginal article

Igor Jíra¹, Petr Ouředníček², Jarmila Skotáková¹, PetrWalek³, Tomáš Jatel¹, Jan Jiří³

¹ Klinika dětské radiologie, Pracoviště dětské medicíny FN a LF MU, Brno

² Klinika zobrazovacích metod, Nemocnice U sv. Anny FN, Brno

³ Ústav biomedicínského inženýrství, Vysoké učení technické, FEKT, Brno

Aim: To evaluate the possibility of 30% radiation dose reduction using an innovative hybrid iterative reconstruction technique called iDose on image quality of CT brain imagesin children, adolescents and adults.

Methods: Brain CT was done in forty patients of various age, scanned on CT64 (Philips Healthcare). Obtained data were reconstructed using various kernels and consequently by the new iDose (Philips Healthcare, NL) hybrid iterative reconstruction prototype on 3 different iD levels (ID30, ID 50, ID70 and multi-resolution /MR/ option). The images were compared to conventional FBP (filtered back projection). The assessment was subjective and objective.

Results: Analysis of the variance showed a decrease of noise corresponding to ID levels (Fig. 1) and no differences to MR option. The combination of the filter UA in combination with ID70 led to smoother images but with fewer details, as shown in Fig. 1. An improvement of image quality has been seen when using the MR option. This combination using the higher kernel filters UB showed an improvement of smaller details and higher impact in the adult group while was less pronounced for the children group (Fig. 1). The reduction of dose decreased the image quality in both FBP and ID images, however the ID70UAMR and ID70UBMR reconstructions have compensated for this deterioration. The inter-observer variability was found at 1.1 and 1.3 points respectively.

Conclusion: iDose enables CT examination with reduced radiation dose without deteriorating the diagnostic value of image data.

Keywords: CT examination, hybrid iterative reconstruction technique, radiation dose reduction

Accepted: January 15, 2012; Published: March 1, 2012  Show citation