CEFLA MyRay Hyperion X9 - Stray Radiations

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OPERATOR'S MANUAL
EN
1.8.11. STRAY RADIATIONS
Leaked radiation measurement is highly influenced by ambient conditions, such as wall composition and positioning,
therefore, under certain circumstances, the detected values can be significantly different.
The measurement points used are at 0.5 m, 1.0 m and 2.0 m, respectively, from a central rotation axis.
The circular measurement points are determined based on the patient bite position on the machine.
Leaked radiations are measured in full panoramic mode or in 3D mode, with maximum field (13x13) for well-built
patients, selected by means of a cylindrical PMMA phantom (16 cm Ф x 17 cm height), simulating the patient head.
1) Standard panoramic examination: leaked radiations measured at the maximum usage percentage allowed by the
X-ray generator (corresponding to an average anode power of 42 W).
Distance between rotation axis and measurement point
(Circular measurement points)
Leaked radiations *
0.5 m
40 µGy / h
1.0 m
13 µGy / h
2.0 m
3 µGy / h
3.0 m
1.5 µGy / h
2) Standard panoramic examination: leaked radiations measured at the current average usage percentage or based
on 4 examinations per hour.
Distance between rotation axis and measurement point
(Circular measurement points)
Leaked radiations *
0.5 m
6 µGy / h
1.0 m
1.5 µGy / h
2.0 m
0.5 µGy / h
3.0 m
0.2 µGy / h
3) 3D High Resolution 13x13: leaked radiations measured at the maximum usage percentage allowed by the X-ray
generator (corresponding to an average anode power of 42 W).
Distance between rotation axis and measurement point
(Circular measurement points)
Leaked radiations *
0.5 m
640 µGy / h
1.0 m
160 µGy / h
2.0 m
40 µGy / h
3.0 m
20 µGy / h
4) 3D High Resolution 13x13: leaked radiations measured at the current average usage percentage or based on 4
examinations per hour.
Distance between rotation axis and measurement point
(Circular measurement points)
Leaked radiations *
0.5 m
45 µGy / h
1.0 m
11 µGy / h
2.0 m
3 µGy / h
3.0 m
1.5 µGy / h
* It is the maximum value at 15 cm above the horizontal plane of intersection with patient bite. Other values on the
vertical axis are lower than these values.