The increasing use of computed tomography (CT) in healthcare has raised concerns in both the Radiologic and wider communities about the effects of ionizing radiation. CT image quality is defined by contrast resolution, spatial resolution, image noise and artefacts, and it is known that reducing radiation dose will increase image noise, and therefore, compromise CT image quality [1,2]. The need to reduce radiation dose to patients, while maintaining image quality, has driven the rapid development of iterative reconstruction techniques. Statistical iterative reconstruction (SIR) techniques model...

Patients First Group 32 consecutive adult patients Presenting for CE-CTAP Scanned between June and July 2014 Scanned using Standard Radiation Dose Protocol Second Group 32 consecutive adult patients Presenting for CE-CTAP Scanned between August and November 2014 Scanned using 24% Reduced Radiation Dose Protocol Patients were excluded if CT scan was significantly degraded by motion artefacts. Scanning Technique 256-slice Multidetector CT (MDCT) Cranio-caudal scanning direction Scan range covering from above the diaphragm superiorly to below bony pelvis inferiorly Detector collimation 128 x 0.625 Tube Voltage...

Cohort Characteristics Group 1 (Standard Dose) 50% male (16 male, 16 female) Mean age 65.4 years (range 26 - 99) Mean BMI 24.6 (range 16 – 30) Mean DLP 504.3 mGy.cm (range 300.4 – 691.5) Group 2 (Reduced Dose) 40% male (13 male, 19 female) Mean age 64.2 years (range 31 - 87) Mean BMI 24.7 (range 15 – 32) Mean DLP 412.7 mGy.cm (range 249.5 – 610.3) Data Analysis Attenuation Attenuation values of organs were similar across the 2 groups Attenuation values were also...

KBIR has the capability of both decreasing radiation dose and reducing image noise. It is, therefore, able to produce thinner image slices of similar image quality to SIR for both standard and reduced dose protocols, improving organ assessment and lesion detection. Further image quality review will help to confirm this. This study also implies that KBIR allows further radiation dose reduction that is greaterthan 24% without compromising image quality. This is particularly important in paediatric and young adult patients where the least possible radiation should...

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