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Radiol Phys Technol. 2013 Jul;6(2):349-55. doi: 10.1007/s12194-013-0207-4. Epub 2013 Apr 19.

A new reference point for patient dose estimation in neurovascular interventional radiology.

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Department of Radiology, Chiba Cardiovascular Center, 575 Tsurumai, Ichihara, Chiba 290-0512, Japan.


In interventional radiology, dose estimation using the interventional reference point (IRP) is a practical method for obtaining the real-time skin dose of a patient. However, the IRP is defined in terms of adult cardiovascular radiology and is not suitable for dosimetry of the head. In the present study, we defined a new reference point (neuro-IRP) for neuro-interventional procedures. The neuro-IRP was located on the central ray of the X-ray beam, 9 cm from the isocenter, toward the focal spot. To verify whether the neuro-IRP was accurate in dose estimation, we compared calculated doses at the neuro-IRP and actual measured doses at the surface of the head phantom for various directions of the X-ray projection. The resulting calculated doses were fairly consistent with actual measured doses, with the error in this estimation within approximately 15%. These data suggest that dose estimation using the neuro-IRP for the head is valid.

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