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In-patient to isocenter KERMA ratios in CT.

Walter Huda¹, Kent M Ogden, Robert L Lavallee

¹Department of Radiology and Radiological Science, Medical University of South Carolina, Charleston, SC 29425-3230, USA.

Medical Physics

|October 14, 2011

Summary

This summary is machine-generated.

This study demonstrates that relative KERMA (Kinetic Energy Released per unit MAs) values from a Rando phantom can estimate organ doses in CT scans. These findings aid in calculating patient radiation exposure during computed tomography examinations.

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Area of Science:

Medical Physics
Radiological Dosimetry

Background:

Accurate estimation of organ doses in computed tomography (CT) is crucial for patient safety.
Current methods may not always provide precise in-patient dose assessments.
Utilizing anthropomorphic phantoms offers a standardized approach to radiation dosimetry.

Purpose of the Study:

To establish a method for estimating in-patient organ KERMA (Kinetic Energy Released per unit MAs) during CT scans.
To correlate in-patient KERMA with isocenter free-in-air KERMA measurements using a Rando phantom.
To provide a basis for more accurate patient dose calculations in CT examinations.

Main Methods:

Experimental determination of KERMA ratios (R(K)) using lithium fluoride chips (TLD-100) in a Male Rando Phantom.
Measurements were taken at 400 individual points and 25 organs across various CT scanner settings (GE LightSpeed Ultra and Siemens Sensation 16) and voltages (80, 120, 140 kV).
KERMA ratios were calculated as the ratio of phantom-measured KERMA to isocenter free-in-air KERMA.

Main Results:

Median KERMA ratios (R(K)) at 120 kV were 0.60 (GE) and 0.64 (Siemens).
R(K) values varied with phantom location, being lower in the pelvis and higher in the cervical spine compared to the head, chest, and abdomen.
X-ray tube voltage significantly impacted R(K), with lower voltages decreasing and higher voltages increasing the ratio.

Conclusions:

Relative KERMA values obtained from a Rando phantom can effectively estimate organ doses in adult CT patients.
Isocenter free-in-air KERMA measurements, when combined with phantom-derived ratios, provide a practical method for dose estimation.
Energy-appropriate conversion factors are necessary for accurate conversion from in-patient air KERMA to tissue dose.