Journal of Medical Physics
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Year : 2002  |  Volume : 27  |  Issue : 2  |  Page : 58-64

Evaluation Of Image Quality Using ACR Phantom And Beam Quality Assessment Of Mammography Equipment



Correspondence Address:
H K Bandhu


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Source of Support: None, Conflict of Interest: None


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It has been observed that despite technical improvements, wide ranges of image quality and dose still exist in the current practice of mammography. In the current investigation, Mammography quality assurance (QA) procedures have been conducted using American College of Radiology (ACR) accredited phantom (RMI 156; Middleton, WI, USA) on a Siemens Mammography unit (Model 3000), in the light of ACR criteria. In addition, other quality assurance tests (kVp accuracy, collirnation test, focal spot size and HVL evaluation) were also performed for the assessment of unit performance and also to assure that the half value layer (HVL) of the x-ray beam is adequate to minimize patient breast dose, with good image contrast. With the evaluation of accreditation phantom (RMI-156), maximum of 9 visibility details were displayed bas per acceptability limits of ACR scoring criteria. The result of kVp accuracy, HVL and the calculated effective focal spot size for the mammographic unit were also found to be well within the specified values. Entrance exposure rate (EER) was found to be ranging from 0.8 - 1.9 R (7-16.5 mGy in air). The calculated maximum average glandular dose was found to be 3.4 mGy at 32 kVp. It is recommended that similar specific quality control standards must be adopted and applied at every centre engaged in the practice of mammography. The ACR mammography accreditation criteria can provide baseline information about the quality of mammography.


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