Philips Azurion - 19.1.3 Dose Related Definitions

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Figure 194 Top view of the paent table
Legend
1 Doctor side 3 Head end
2 Nurse side 4 Foot end
19.1.3 Dose Related Denions
The following denions are used in these Instrucons for Use.
Paent Entrance Reference Point
The paent entrance reference point is an approximaon for the locaon of the paent’s skin (see IEC
60601-1-3:2008, 3.43 and IEC 60601-2-43:2010, 203.5.2.4.5.101d)).
NOTE The distance from focal point to the isocenter can be dierent per type of geometry (see 4.1),
resulng in dierent reference air kerma values under the same circumstances.
NOTE The paent entry reference point may also be known as the intervenonal reference point.
It is located on the central axis of the X-ray beam, 15 cm from the isocenter, towards the focal spot.
Depending on the paent’s size, the table height and the direcon of the X-ray beam, the PERP may be
outside the paent (as in the le gure), may coincide with the skin surface, or may be inside the
paent (as in the right gure).
Figure 195 Paent entrance reference point
Legend
1 X-ray tube 4 Entrance surface
2 Detector 5 Paent entrance reference point
Glossary Denions
Azurion Release 1.2 Ins
trucons for Use 386 Philips Healthcare 4522 203 52421