Variasi Parameter Filed of View (FoV) terhadap Nilai Signal to Noise Ratio (SNR) Dan Contras to Noise Ratio (CNR) pada Pemeriksaan Lumbal Dengan Potongan Axial

Zofi Dwi Prihatini; Ni Nyoman Ratini; I Putu Tedy Indrayana; Gusti Ngurah Sutapa; I Wayan Supardi; I Gde Antha Kasmawan

doi:10.29408/kpj.v9i3.33351

Authors

Zofi Dwi Prihatini Universitas Udayana
Ni Nyoman Ratini Universitas Udayana
I Putu Tedy Indrayana Universitas Udayana
Gusti Ngurah Sutapa Universitas Udayana
I Wayan Supardi Universitas Udayana
I Gde Antha Kasmawan Universitas Udayana

DOI:

https://doi.org/10.29408/kpj.v9i3.33351

Keywords:

CNR; FOV; Lumbal; MRI; SNR

Abstract

Magnetic Resonance Imaging (MRI) is widely used to evaluate spinal pathology, with image quality strongly influenced by acquisition parameters such as the Field of View (FOV). This study investigates the effect of small FOV adjustments on the Signal-to-Noise Ratio (SNR) and Contrast-to-Noise Ratio (CNR) in axial T2-weighted Fast Spin Echo (FSE) lumbar spine MRI. This study offers one of the quantitative evaluations of clinically realistic FOV variations, addressing a gap between routine protocol adjustments and evidence-based image quality optimization. This experimental study prospectively examined thirty patients undergoing routine lumbar spine MRI using a Philips Ingenia CX 1.5T system. Axial T2-weighted FSE images were acquired with three FOV settings (170 mm × 170 mm, 190 mm × 190 mm, and 210 mm × 210 mm), while all other imaging parameters were kept constant. Image quality was assessed by measuring mean signal intensities in standardized regions of interest (ROIs) placed in the intervertebral disc, cerebrospinal fluid (CSF), and surrounding fat tissue, from which SNR and CNR were calculated and statistically compared across FOV settings. The results showed increasing trends in SNR and CNR with larger FOV values; however, these differences were not statistically significant (p > 0.05), indicating that small FOV enlargements produce minimal voxel size changes and negligible effects on image quality. Clinically, these findings suggest that minor FOV adjustments can be safely applied to accommodate patient anatomy or positioning without compromising image quality, while larger FOV changes are required to achieve meaningful improvements in SNR and CNR.

References

Althofyandi, M. (2023). Analisis Pengaruh Variasi Field of View Terhadap Kualitas Citra MRI Lumbal Potongan Sagital Sequence T2 Weightes Fast Spin Echo Pada Kasus Hernia Nukleus Pulposus. Tugas Akhir. Jakarta: Politeknik Kesehatan Kementrian Kesehatan Jakarta II.

Arty, N., Dewang S., Astuti S. D., Rifaldi, & Purwanto. (2024). Penentuan Nilai Signal to Noise Ratio (SNR) pada Citra Magnetic Resonance Imaging Berdasarkan Variasi Time Repetition Time Echo. Berkala Fisika. 27(1): 32-39.

Bernstein, M. A., King, K. F., & Zhou, X. J. (2004). Handbook of MRI Pulse Sequences (1st ed). Elsevier.

Bushberg, J. T., Seibert, J. A., Leidholdt, E. M., & Boone, J. M. (2020). The Essential Physics of Medical Imaging (4th ed.). Lippincott Williams & Wilkins.

Duri, S. H. E., Juliantara I P. E., & Sugiantara I W. A. (2022). Analisis Perbedaan Contrast to Noise Ratio (CNR) terhadap Variasi K-Space Filling pada Pemeriksaan MRI Brain Sekuen T2WI Axial dengan Klinis Space Occupying Lession (SOL). KLINIK. 3(1): 174-184.

Fatimah, Dahjono J., & Sativa M. R. (2018). Optimisasi Field of View (FOV) Terhadap Kualitas Citra Pada T2WI FSE MRI Lumbal Sagital. JImeD: J. Imag. Diag. 1(1): 1-5.

Haacke, E. M., Brown, R. W., Thompson, M. R., & Venkatesan, R. (1999). Magnetic Resonance Imaging: Physical Principles and Sequence Design. Wiley-Liss.

Kusumaningsih, L. P. R., Suryatika I B. M., Trisnawati N. L. P., & Irhas R. (2023). Pengaruh Slice Thickness terhadap Signal to Noise Ratio (SNR) dari Hasil Penyinaran CT Scan di RSUP Prof. Dr. I.G.N.G Ngoerah. Kappa Journal. 7(2): 326-330.

Maxwell, A. W. P., Keating D. P., Nickerson J. P. (2015). Incidenental Abdominopelvic Findings on: Abdominopelvic Findings on Expanded Field-of-View Lumbar Spinal MRI: Frequency, Clinical Importance, and Concordance in Interpretation by Neuroimaging and Body Imaging Radiologists. Clin. Rad. 70(2): 161-167.

McRobbie, D. W., Moore, E. A., Graves, M. J., & Prince, M. R. (2017). MRI from Picture to Proton (3rd ed.). Cambridge University Press.

Nirmala, F. U. (2019). The Effect of Number of Excitation (NEX) Variation and Blade Technique on T2 Image Quality TSE Sagital Knee MRI. J. Bios. Pascasarjana. 21(1): 32-48.

Nuha, M. D., Prasetya, L., Dharmawa, B. G. (2022). Perbedaan Informasi Citra Anatomi Pada Pemeriksaan MRI Lumbal T2WI TSE FAT Saturation dan T2WI TSE DIXON Potongan Sagital Pada Klinis Hernia Nucleus Pulposus di RSUP Prof. Dr. I Goesti Ngoerah Gde Ngoerah Denpasar. JURRIKE. 1(2): 38-47.

Nurhikmah. (2022). Perbedaan Kualitas Citra Pada Pemeriksaan MRI Ankle Joint Dengan Menggunakan Coil Ankle dan Flex Coil di Instalasi Radiologi RS. Universitas Hasanuddin Makassar. Humantech: J. Ilmiah Mult. Indonesia. 2(2): 235-248.

Nurvan, H., Wardani, A. K., & Palupi, N. E. (2023). Karakteristik Pemeriksaan Pasien di Instalasi Radiologi Rumah Sakit Ananda Babelan Bekasi Periode Agustus 2021 - Juli 2022. J. Pandu Husada. 4(4): 1-14.

Pramana, K. A. C., Jeniyanthi N. P. R., & Dharmawan B. G. (2022(. Pengaruh Penggunaan Parameter Number Scan Average Terhadap Signal to Noise Ratio dan Scan Time Pada Pemeriksaan Magnetic Resonance Imaging: Studi Literature Review. J. Rad.Indonesia. 5(1): 48–53.

Westbrook, C., Roth, C. K., & Talbot, J. (2018). MRI in Practice (5th ed.). Wiley-Blackwell.