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Table 3 Organ dose variation according to tube voltage. We compared 100 and 120 kVp, 80 and 100 kVp, and 120 and 140 kVp keeping as reference respectively 120, 100, and 120 kVp. For each organ implemented in the four software studied, we calculated the discrepancies as difference of the values obtained for each couple of voltages. These discrepancies are then normalised to the organ dose at reference voltage. We reported here only the minimum and the maximum values of discrepancy found for each class of organs subdivided according to the position relative to the scan region

From: Patient organ and effective dose estimation in CT: comparison of four software applications

 

CT-Expo (%)

NCICT (%)

NCICTX (%)

Virtual Dose (%)

100–120 kVp (120 kVp as reference)

 Organs inside the scan region

< 1

1–5

0–6

1–4

 Partially irradiated organs

< 1

3–8

3–9

0–6

 Organs outside the scan region

< 1

1–8

2–9

0–13

 Distributed organs

< 1

1–9

1–9

3–6

80–100 kVp (100 kVp as reference)

 Organs inside the scan region

< 1

1–6

0–11

0–4

 Partially irradiated organs

< 1

3–8

2–16

1–6

 Organs outside the scan region

< 1

1–17

2–17

1–14

 Distributed organs

< 1

2–17

2–13

3–6

120–140 kVp (120 kVp as reference)

 Organs inside the scan region

0

0

0

2–8

 Partially irradiated organs

0

0

0

6–11

 Organs outside the scan region

0

0

0

8

 Distributed organs

0

0

0

3–9%