Konica Minolta AeroDR System Operation Manual page 114

8.2 Pediatric patients' use;
This device (CS-7) is designed to perform the calculation, display and DICOM tag output of Exposure Index (EI),
Target Exposure Index (TI) and Deviation Index (DI) for each exposed image. In the IEC62494-1, the image quality
shall be managed while viewing the DI from the TI, rather than using the EI value itself. The DI is calculated from the
preset TI for each body part and EI acquired from an image actually exposed (as shown in the formula below).
And, as shown in the table 2 below, the DI against the difference from TI of EI becomes 0 when EI is equal to TI, it
becomes a negative value when EI is lower than TI, and it becomes a positive value when EI is higher than TI.
More specifically, managing the DI enables the deviation from the target dose for each patient to be managed.
Perform the exposure under the exposure condition suitable for each patient and body part so that the DI comes
near to 0. As children have a greater cancer risk due to their high radiation sensitivity, be very careful so as to avoid
the excessive irradiation and/or re-exposure due to low dose (Low image quality deterioration of
graininess). This Index is used to manage the image quality through the exposure dose to detector, not used for the
management of patients' exposed dose.
Please follow the x-ray sauce manufacture's guidelines or consult a medical physicist or other qualified personnel to
determine appropriate settings in addition to information that we have provided.
DI = 10·log
Table 2: DI Control Limits
The difference from
DI
TI of EI
-3 -50%
-2 -37%
-1 -21%
0 0%
+1 +26%
+2 +58%
+3 +100%
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( )
EI
TI
Dose Ratio
0.50
0.63
0.79
1.00
1.26
1.58
2.00