Rajiv Azad1, Priyanka Mittal2, Ankur Malhotra3, Sharad Gangrade4. 1. Professor and Head, Department of Radiodiagnosis, Shri Guru Ram Rai Institute of Medical and Health Sciences, Dehradun, Uttarakhand, India. 2. Junior Resident, Department of Radiology, Shri Guru Ram Rai Institute of Medical and Health Sciences, Dehradun, Uttarakhand, India. 3. Assistant Professor, Department of Radiology, Shri Guru Ram Rai Institute of Medical and Health Sciences, Dehradun, Uttarakhand, India. 4. Senior Resident, Department of Radiology, Shri Guru Ram Rai Institute of Medical and Health Sciences, Dehradun, Uttarakhand, India.
Abstract
INTRODUCTION: Differentiating calcification from chronic micro-bleeds on imaging may have important clinical implications. AIM: The present study aimed to evaluate the role and relative advantages of Magnetic Resonance Imaging (MRI) in the detection and differentiation of intracranial calcifications and chronic microbleeds. MATERIALS AND METHODS: The retrospective study comprised of 100 patients having either intracranial calcifications or microhaemorrhages selected on the basis of Computerized Tomography (CT) and MRI using predefined criteria. Two independent blinded observers evaluated the images qualitatively and quantitatively. Single pixel values were taken in the circular Region of Interest (ROI) on magnitude SWI, phase Susceptibility Weighted Imaging (SWI) and Diffusion Weighted Imaging (DWI) for quantitative analysis. RESULTS: Fifty patients with 76 focal calcifications and another 50 patients with 245 chronic microbleeds formed part of the study. Overall sensitivity of SWI in detection of calcification was 93.9% with good inter observer agreeability (k= 0.7) on phase SWI. All the chronic microbleeds were seen on SWI but there was only moderate inter observer agreeability in evaluation of signal on phase component (k= 0.5). Average pixel values of calcifications and chronic microbleeds were -312.5±187 SD and 541.9±301.7 SD respectively on phase SWI, (p=0.0001, <0.05). CONCLUSION: SWI can play a pivotal role in the detection of intracranial calcifications and chronic microbleeds and resolving the ambiguity in their diagnosis.
INTRODUCTION: Differentiating calcification from chronic micro-bleeds on imaging may have important clinical implications. AIM: The present study aimed to evaluate the role and relative advantages of Magnetic Resonance Imaging (MRI) in the detection and differentiation of intracranial calcifications and chronic microbleeds. MATERIALS AND METHODS: The retrospective study comprised of 100 patients having either intracranial calcifications or microhaemorrhages selected on the basis of Computerized Tomography (CT) and MRI using predefined criteria. Two independent blinded observers evaluated the images qualitatively and quantitatively. Single pixel values were taken in the circular Region of Interest (ROI) on magnitude SWI, phase Susceptibility Weighted Imaging (SWI) and Diffusion Weighted Imaging (DWI) for quantitative analysis. RESULTS: Fifty patients with 76 focal calcifications and another 50 patients with 245 chronic microbleeds formed part of the study. Overall sensitivity of SWI in detection of calcification was 93.9% with good inter observer agreeability (k= 0.7) on phase SWI. All the chronic microbleeds were seen on SWI but there was only moderate inter observer agreeability in evaluation of signal on phase component (k= 0.5). Average pixel values of calcifications and chronic microbleeds were -312.5±187 SD and 541.9±301.7 SD respectively on phase SWI, (p=0.0001, <0.05). CONCLUSION: SWI can play a pivotal role in the detection of intracranial calcifications and chronic microbleeds and resolving the ambiguity in their diagnosis.
Authors: Richard Bitar; General Leung; Richard Perng; Sameh Tadros; Alan R Moody; Josee Sarrazin; Caitlin McGregor; Monique Christakis; Sean Symons; Andrew Nelson; Timothy P Roberts Journal: Radiographics Date: 2006 Mar-Apr Impact factor: 5.333
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