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SErIES IAEA HumAn HEAltH SErIES IAEA Hum

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K i Patient:<br />

Radiographic Calculation<br />

2. Calculated incident air kerma and entrance surface air kerma<br />

Tube focus to tabletop distance, d FTD : ________ mm<br />

Distance, d, of dosimeter from tube focus:________ mm<br />

Patient Weight Tube voltage Tube loading<br />

Patient<br />

Field size<br />

thickness, t P<br />

Tube output Y(d) Incident air<br />

at distance d a b<br />

kerma, K i<br />

Entrance surface<br />

c<br />

air kerma, K e<br />

(kg) (kV) (mA·s) (mm) (mm × mm) (mGy/(mA·s)) (mGy) (mGy)<br />

The value of Y(d) is interpolated from measured values of tube outputs.<br />

d<br />

Incident air kerma, Ki = Y( d)<br />

PItÁ<br />

= _______ mGy.<br />

Ë dFTD - t<br />

˜<br />

P ¯<br />

Entrance surface air kerma, K e = K i B = _______mGy.<br />

Ê<br />

ˆ<br />

2<br />

a<br />

b<br />

c<br />

181

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