PERBEDAAN PENERAPAN ACCELERATION FACTOR TERHADAP KARAKTERISTIK CITRA DIAGNOSTIK T2WI FSE PADA MRI LUMBAL KASUSHERNIATED NUCLEUS PULPOSUS (HNP)

Abstract

Background: Patients with Herniated Nucleus Pulposus (HNP) cases have a bigger chance to do a movement during MRI examination. The technique of parallel imaging is a technique that can increase the speed of MRI data acquisition by passing through several lines of phase encoding in k-space. The GRAPPA technique is one of the methods to reconstruct data on MRI with better overall image quality. The purpose of this research is to know the difference of diagnostic image characteristic which is resulted in applying acceleration factor 2, 3, and 4 in parallel imaging of GRAPPA method and know the optimal acceleration factor to obtain MRI image of lumbar HNP case. Methods: This research is quantitative research with descriptive approach. The study was conducted by MRI Siemens 3 T. The data were 30 MRI images of lumbar sagittal of HNP cases on T2WI FSE with acceleration factor 2, 3, and 4 GRAPPA methods. Result: The results of this study indicate that there are differences in diagnostic image characteristics in the application of acceleration factor 2 and 4, 3 and 4 with the VGA test. Acceleration factor value optimal with VGC test known is acceleration factor 2 and 3. Conclusion: Based on the result there were different diagnostic image characteristics of MRI Lumbar in sagittal plane Fast Spin Echo (FSE) sequence with variation acceleration factor 2, 3 and 4 parallel imaging GRAPPA method in case HNP. The optimal value of variation acceleration factor for MRI Lumbar examination of HNP is 2 dan 3.