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. 2009 Apr 22;10(3):235–243. doi: 10.3348/kjr.2009.10.3.235

Fig. 3.

Fig. 3

Paired transverse postcontrast CT images of subjects with BMI 27.3 and window width and level of 1,200 HU and 300 HU, respectively.

A. 1-mm thick transverse image obtained at 100 kVp and 620 mAs in 78-year-old man with noise level of 25.7 HU on pre-contrast image.

B. 1-mm thick transverse obtained at 120 kVp and 500 mAs in 62-year-old man with noise level of 22.9 HU on pre-contrast image.

Objectively measured image noise was 43.4 HU for 100-kVp image (A) and 31.2 HU for 120-kVp image (B). However, subjective noise level between both images was considered to be equal. Mean attenuation of sinus Valsalva was 583 HU and 319 HU, respectively. Readers chose 100-kVp image for higher image contrast and preference of reading. Image quality score was 4 for 100-kVp image and 3 for 120-kVp image. Estimated effective radiation doses were 7.74 and 9.62 mSv, respectively.