scholarly journals Analisis Variasi Time Repetition (TR) terhadap Signal to Noise Ratio dan Contrast to Noise Ratio pada Pemeriksaan MRI Cervical T2 Weighted Fast Spin Echo (FSE) Potongan Sagital

2016 ◽  
Vol 2 (1) ◽  
pp. 119-123
Author(s):  
Rini Indrati ◽  
Heriansyah Heriansyah ◽  
Wakhrudin Wakhrudin
Keyword(s):  
Signal To Noise Ratio ◽  
Spin Echo ◽  
Fast Spin Echo ◽  
Mean Deviation ◽  
P Value ◽  
Signal To Noise ◽  
Mri Examination ◽  
Spin Echo Sequence ◽  
Noise Ratio ◽  
Fast Spin

Background: Time Repetition (TR) is one parameter that can affect the value of Signal to Noise Ratio (SNR) and Contrast to Noise Ratio (CNR). The purpose of this research is to know the effect of variation of TR value on SNR and CNR on cervical MRI examination with Sagital T2 Weighted Fast Spin Echo sequence and to know the most optimal TR value from the variation of TR value to SNR and CNR on cervical MRI examination with Sagital T2 Weighted Fast Spin Echo.Methods: The type of this study was experimental study. The study was conducted using MRI 1.5 Tesla at Kasih Ibu Denpasar Hospital. Data were 40 MRI cervical images of sagital Fast Spin Echo from 10 volunteers with four variations of TR (2500 ms, 3000 ms, 3500 ms, and 4000 ms). The SNR and CNR values are measured by identifying the Region of Interest (ROI) in the corpus, discus, cerebro spinal fluid (CSF), and medula spinalis regions to obtain the average signals and compared with the mean deviation of the background. Data was analyzed by regression test to know the influence and by Anova test.Results: The result of the research showed that there was the influence of TR value to SNR and CNR of MRI Cervical Sagital T2 FSE. There was a strong correlation between the variation of TR values with SNR and CNR Cervical with p-value 0.05, the optimal TR value obtained in Cervical Sagital T2 FSE anatomical image on MRI 1,5 Tesla modality was 3500 ms.Conclusion: Time Repetition affected the signal to noise ratio and contrast to noise ratio. TR 3500 ms produced the most optimal cervical MRI image quality.

scholarly journals Analisis Pengaruh Perubahan Number Scan Average Terhadap Signal to Noise Ratio Pada Citra MRI Brain Sekuen T2 Fast Spin Echo (FSE)

2019 ◽  
Vol 21 (1) ◽  
pp. 1
Author(s):  
Rakhmat Kurniawan ◽  
Puji Hartoyo ◽  
Ni Larasati Kartika Sari
Keyword(s):  
Signal To Noise Ratio ◽  
Spin Echo ◽  
Median Filter ◽  
Fast Spin Echo ◽  
Signal To Noise ◽  
Mri Brain ◽  
Noise Ratio ◽  
Fast Spin

<div style="’text-align: justify;">Telah dilakukan penelitian tentang pengaruh perubahan nilai parameter Number Scan Average (NSA) terhadap kualitas citra MRI yang direpresentasikan oleh nilai Signal to Noise Ratio (SNR). Penelitian dilakukan menggunakan citra otak potongan aksial menggunakan sekuen T2 Fast Spin Echo. Variasi nilai NSA yang digunakan adalah 2, 4 dan 6. Nilai SNR dihitung memanfaatkan algoritma median filter pada software Matlab 2013a. SNR diperoleh dengan membandingkan nilai piksel rata-rata dari citra setelah diberi median filter dengan nilai piksel rata-rata dari selisih citra sebelum dan sesudah diberi median filter. Nilai SNR pada NSA 2,4 dan 6 masing-masing sebesar 81,3411, 85,8796, dan 87,2757. Hal tersebut menunjukkan bahwa semakin besar nilai NSA, semakin besar pula nilai SNR yang diperoleh. Kenaikan NSA dari 2 ke 4, meningkatkan NSA sebesar 5,6%, dan perubahan NSA dari 4 ke 6, meningkatkan SNR sebanyak 1,6%. Namun, kenaikan nilai NSA juga menambah waktu scanning. Kenaikan NSA dari 2 ke 4, dan 4 ke 6, menambah waktu scanning rata-rata sebesar 2 menit.</div>

Low Flip Angle Gradient Echo Magnetic Resonance Imaging of the Cervical Spine at 0.3 Tesla

1989 ◽  
Vol 30 (4) ◽  
pp. 343-348 ◽  
Author(s):  
S. Holtås ◽  
F. Ståhlberg ◽  
H. Nilsson ◽  
E.-M. Larsson ◽  
A. Ericsson
Keyword(s):  
Cervical Spine ◽  
Signal To Noise Ratio ◽  
Spin Echo ◽  
Flip Angle ◽  
Acquisition Time ◽  
Gradient Echo ◽  
Signal To Noise ◽  
Spine Imaging ◽  
Spin Echo Sequence ◽  
Noise Ratio

The influence of flip angle and TR on signal to noise ratio and contrast between cerebrospinal fluid (CSF) and cord was evaluated in cervical spine imaging in 5 volunteers, using gradient echo technique. All experiments were performed on a 0.3 tesla Fonar β-3000 M scanner using solenoidal surface coils. The most useful sequence was considered to be TR/TE=300/12 ms and 10° flip angle. This sequence provided images with a ‘myelographic appearance’ with good delineation of cord, CSF and epidural space. The grey and white matter was also regularly visualized. The acquisition time was considerably shorter than would have been necessary if a long TR/TE spin echo sequence had been used to obtain the same contrast pattern and the sequence was not as sensitive to motion as was the spin echo sequence. The sequence was also evaluated in 10 patients with degenerative disease and in 5 with lesions in the cord. The gradient echo sequence was found to be equal to or better than short and long TR/TE spin echo sequences in demonstrating narrowing of the spinal canal and cord lesions. The drawback is the limited signal to noise ratio.

scholarly journals Performance of PROPELLER FSE T2WI in Reducing Metal Artifacts for Patients with Various Material Porcelain Fused To Metal Crown: A Preliminary Study

2022 ◽  
Author(s):  
Wenjin Li ◽  
Jing Shi ◽  
Wenjin Bian ◽  
Jianting Li ◽  
Xiaoqing Chen ◽  
...  
Keyword(s):  
Image Quality ◽  
Signal To Noise Ratio ◽  
Spin Echo ◽  
Pure Titanium ◽  
Fast Spin Echo ◽  
Cobalt Chromium ◽  
Signal To Noise ◽  
Metal Artifacts ◽  
Pd Alloy ◽  
Noise Ratio

Abstract This study aimed to compare MRI quality between common fast spin echo T2 weighted imaging (FSE T2WI) with periodically rotated overlapping parallel lines with enhanced reconstruction (PROPELLER) FSE T2WI for patients with various porcelain fused to metal (PFM) crown and analyze the value of PROPELLER technique in reducing metal artifacts. Common FSE T2WI and PROPELLER FSE T2WI sequences for axial imaging of head were applied in participants with different PFM crowns: cobalt-chromium (Co-Cr) alloy, pure titanium (Ti), gold-palladium (Au-Pd) alloy. Two radiologists evaluated overall image quality of section in PFM using a 5-point scale qualitatively and measured the maximum artifact area and artifact signal-to-noise ratio (SNR) quantitatively. The metal crown with the least artifacts and the optimum image quality shown in common FSE T2WI and PROPELLER FSE T2WI were in Au–Pd alloy, Ti, and Co–Cr alloy order. PROPELLER FSE T2WI was superior to common FSE T2WI in improving image quality and reducing artifact area for Co-Cr alloy (17.0±0.2% smaller artifact area, p＜0.001) and Ti (11.6± 0.7 % smaller artifact area, p=0.005), but had similar performance compared to FSE T2WI for Au-Pd alloy. For all PFMs, PROPELLER FSE T2WI significantly reduced the signal-to-noise ratio (SNR) of artifact (393.57±89.75 VS. 214.05±70.45, p < 0.001) when compared to common FSE T2WI.Therefore, the different PFM crown generate varying degrees of metal artifacts in MRI, and the PROPELLER can effectively reduce metal artifacts especially in the PFM crown of Co-Cr alloy.

scholarly journals Anode heel effect application with step wedge against effect of signal to noise ratio in computed radiography

2020 ◽  
Vol 4 (3) ◽  
pp. 75-82
Author(s):  
Ni Nyoman Ratini ◽  
I Made Yuliara ◽  
Windaryoto Windaryoto
Keyword(s):  
Computed Radiography ◽  
Signal To Noise Ratio ◽  
Pearson Correlation ◽  
P Value ◽  
Signal To Noise ◽  
Correlation Test ◽  
Pearson Correlation Test ◽  
R Value ◽  
Noise Ratio ◽  
Heel Effect

It was researched on the application of Anoda Heel Effect (AHE) with a step wedge on the effect of Signal To Noise Ratio (SNR) on Computed Radiography (CR) has been carried out. This research was conducted on a 21 step wedge with two treatments, namely the application of AHE and without the application of AHE. This measurement is repeated three times on radiographs to obtain a total image of six images (without the application of AHE as many as three images and with the application of AHE as many as three images). The results of taking radiographs using AHE and without AHE were measured using the RadiAnt Dicom Viewer program. The SNR value on the step wedge image without the AHE application has an average of 26.89. The SNR value on the step wedge image using AHE is 60.54. The results of the correlation test (Pearson correlation test) on the SNR showed that there was a significant and very strong effect of the application of AHE on the step wedge on the SNR in CR (p-value <0.001 and the R-value ranging from 0.600 to 0.799).

scholarly journals Analisis Perbandingan Nilai Signal to Noise Ratio (SNR) pada Pemeriksaan MRI Ankle Joint dengan Menggunakan Quad Knee Coil dan Flex/Multipurpose Coil

2017 ◽  
Vol 3 (1) ◽  
pp. 220-224
Author(s):  
Ahda Nur Arifah ◽  
Yeti Kartikasari ◽  
Emi Murniati
Keyword(s):  
Achilles Tendon ◽  
Ankle Joint ◽  
Subtalar Joint ◽  
Signal To Noise Ratio ◽  
P Value ◽  
Signal To Noise ◽  
Talocrural Joint ◽  
Knee Coil ◽  
Noise Ratio ◽  
Joint Examination

Background : Research on the difference comparison the value of Signal To Noise Ratio (SNR) at MRI Ankle Joint examination using Quad Knee Coil and Flex/Multipurpose Coil at the hospital's radiology installation Telogorejo Semarang. Quad knee coil is a volume coil, is a coil that can act as a transmitter and receiver at the same RF signal (transreceiver). Flex / Multipurpose Coil is a surface coil which has a high SNR for a superficial examination (a small organ). The purpose of this research is to know comparison the value of signal to noise ratio (SNR) and higher the value of signal to noise ratio (SNR) at MRI Ankle Joint examination using Quad Knee Coil and Flex / Multipurpose Coil.Method : This type of research is quantitative experimental approach. The research data which 6 samples. Rate includes images subjectively talocalcaneal interosseous ligament, talocrural joint, subtalar joint, the calcaneus, tibia, talus, and the Achilles tendon. Then the results of the data in Paired T-Test tested.Results : Test results that there are differences in comparison the value of signal to noise ratio (SNR) at MRI Ankle Joint examination using Quad Knee Coil and Flex / Multipurpose Coil which has a p-value / sig for all of 0.002, and each criterion that have talocalcaneal interoseous ligament p value 0.026, talocrural joint p value 0.017, subtalar joint p value 0.001, calcaneus p value 0.002, tibia p value 0.003, talus p value 0.006, and achilles tendon p value 0.012. This is in accordance with the calculated average value SNR on the use of Quad Knee Coil is higher at 110.67 because the coil acts as transreceiver and has two preamplifier so as to improve the SNRConclusion : There is a differences in comparison the value of Signal To Noise Ratio (SNR) at MRI Ankle Joint examination using Quad Knee Coil and Flex / Multipurpose Coil.

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