Question

QUESTION 95 Consider the X-ray tube rating charts shown below. If the following examination is made, what would be the highest tube current (in milliamps) that would be considered safe? 1 phase, 3400 RPM, 11° angle, 1.0 mm focal spot, 100 kVp, 0.1 s exposure time 100 mA 200 mA 150 mA 150 mA 300 mA lasoma Kilovolts peak (Vp) 100 Kilovolts peak (kVp) 400 mA 200 mA 10.000 rpm 3400 rpm 140 mm 11 0.005 01 Marcimum exposure time in seconds 0.005.01 0.1 10 20 Maximum exposure time in seconds 200 mA 500 mA 200 A 500 MA 250 MA 300 MA 250 mA 300 mA 700 mA Kilovolts peak (KVp) Kilovolts peak (kVp) 400 mA 500 mA 3400 rpm 16 10mm 11 0005 01 0.1 Maximum exposure time in seconds 1 10 20 mum exposure time in seconds

Answer 1

If we look at the graph iii carefully, it satisfies all the parameters given. For t=0.1 s and 100kVp the graph is not drawn. But the constant currents are drawn for 400 mA and 300mA in the nearby regions. As the behavior shows that firstly, the curves remains almost constant and then decreases with increase in time. From the data shown we can conclude that it can withhold tube current of 350mA for the given conditions.