Cardiac and chest computed tomography (CT) are commonly performed for a wide range of indications.
radiation dose is an important topic and radiation dose reduction is therefore widely investigated.
With the use of iterative reconstruction (IR),
image noise is reduced and thereby allows dose reduction without loss of image quality .
Several studies suggest that radiation dose can be substanially reduced when using IR [1-4],
however it is unknown if dose reduction and/or iterative...
Methods and Materials
Twenty patients underwent chest CT and 28 patients electrocardiogram-triggered cardiac CT on a 256-slice CT scanner without using contrast.
Each patient was scanned four times (routine dose and approximately 45,
60 and 75% reduced dose),
dose reduction was achieved by reducing mAs.
Images were reconstructed using filtered back projection (FBP),
three hybrid (iDose 4 ) levels and three model-based IR (IMR) levels ( Fig. 1 ).
iDose 4 levels 1,
4 and 7 were used for cardiac CT and levels 1,
In total 48 patients (31 males; 60±8.8 years; BMI 28.4±5.1 kg/m 2 ) were included.
The amount of dose per protocol is depicted in table 1.
AVC was present in 14 (29%) and TAC in 17 (57%) patients.
The amount of false postive and negative and number of diagnostic scans (subjective score ≥2) are shown in Fig. 2 for cardiacand Fig. 3 forchest CT.Median mass scores for AVC and TAC at the reference scan were 12.0(1.4-24.0) and 2.7(1.1-15.8) at cardiac CT and 17.0(4.9-50.2) and 455.6(132.6-1796.9)...
AVC and TAC quantification on CT is possible at sub-milliSievert dose using IR.
de Jong PA,
de Heer LM,
Iterative reconstruction techniques for computed tomography part 2: initial results in dose reduction and image quality.
2013 Jun;23(6):1632-42. 2.Hu XH,
Radiation dose of non-enhanced chest CT can be reduced 40% by using iterative reconstruction in image space.
2011 Nov;66(11):1023-9. 3.Katsura M,