Indian Journal of Radiology Indian Journal of Radiology  

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BREAST RADIOLOGY Table of Contents   
Year : 2013  |  Volume : 23  |  Issue : 1  |  Page : 19-25
Role of quantitative pharmacokinetic parameter (transfer constant: Ktrans ) in the characterization of breast lesions on MRI

Department of MRI, Rajiv Gandhi Cancer Institute and Research Centre, New Delhi, India

Correspondence Address:
Taneja Sangeeta
Department of MRI, Rajiv Gandhi Cancer Institute and Research Centre, Sector-5, Rohini, New Delhi - 110 085
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0971-3026.113614

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Background: The semi-quantitative analysis of the time-intensity curves in dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) has a limited specificity due to overlapping enhancement patterns after gadolinium administration. With the advances in technology and faster sequences, imaging of the entire breast can be done in a few seconds, which allows measuring the transit of contrast (transfer constant: K trans ) through the vascular bed at capillary level that reflects quantitative measure of porosity/permeability of tumor vessels. Aim: Our study aims to evaluate the pharmacokinetic parameter K trans for enhancing breast lesions and correlate it with histopathology, and assess accuracy, sensitivity, and specificity of this parameter in discriminating benign and malignant breast lesions. Materials and Methods: One hundred and fifty-one women with 216 histologically proved enhancing breast lesions underwent high temporal resolution DCE-MRI for the early dynamic analysis for calculation of pharmacokinetic parameters (K trans ) using standard two compartment model. The calculated values of K trans were correlated with histopathology to calculate the sensitivity, specificity, and accuracy. Results: Receiver operating characteristic (ROC) curve analysis revealed a mean K trans value of 0.56, which reliably distinguished benign and malignant breast lesions with a sensitivity of 91.1% and specificity of 90.3% with an overall accuracy of 89.3%. The area under curve (AUC) was 0.907. Conclusion: K trans is a reliable quantitative parameter for characterizing benign and malignant lesions in routine DCE-MRI of breasts.

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