Background: Chest radiographic examination often does not use a grid even though the thorax is an object that has a thickness of more than 10 cm so it must use a grid. This study aims to determine the differences and the degree of change in Contrast to Noise Ratio on PA radiographs between using a grid and without using a grid.Methods: This type of research is a pre-experimental quantitative. The research subject is a radiological image of PA thorax made using the grid (50 patients) and without using the grid (patient). The image is analyzed by pixel value using Dicom softwareResults: There is a difference in contrast values on the PA radiographs between those using the Grid and without using the Grid (p-value 0.001). The average value of the contrast on the chest radiograph using a Grid is 2283.60, while the one without using a Grid is 1878.58. Noise value also shows that there is a difference between chest radiographs of PA images using Grid without using Grid (p-value = 0.001). The average thorax photo noise using Grid is 25.32, paired using Grid is 17.84. Statistical test on the value of Contrast to Noise Ratio (CNR) shows that there is a difference between radiographs of PA chest radiography using Grid without Grid (p-value 0.001). The average CNR radiograph of the PA thorax PA using Grid is 100.79, while the CNR value of the radiograph of thorax PA without using Grid is 125.62.Conclusions: There is a Contrast difference between using a grid and without using a grid (p-value 0.001). There is a Noise difference in PA radiographs between using a grid and without using a grid (p-value = 0.001). There is a difference in Contrast to Noise Ratio on the PA chest radiograph between using a grid and without using a grid (p-value 0.001).

Image Quality of Magnetic Resonance Imaging (MRI) has several factors including SNR dan CNR. Influence Factors of SNR depends on the coil used. MRI shoulder joints in several hospitals can be done with different RF Coil, there are M coil flex and shoulder coil. Are there differences in image quality with MRI shoulder joints between the two coils. This study was conducted to determine differentiation SNR and CNR between them in the coronal proton density sequence of MR shoulder joint. This research was quantitative research with an experimental approach. Scanning was done by using Flex M Coil and shoulder coil with 10 samples. The quality image evaluated of SNR and CNR, data were analyzed using paired t-test with α = 5%. The results of the research showed significant differentiation of image quality between using Flex M Coil and shoulder coil in coronal proton density-weighted of MRI Shoulder Joint with p-value SNR < 0,001 and CNR = 0,002. The average of SNR and CNR using shoulder coil is higher than using flex M coil, so the shoulder coil has the better image quality of coronal proton density-weighted MRI shoulder joint.

Introduction: Quality and dose factors are very important in radiodiagnostics. To produce a constant radiographic quality, the density and contrast produced must remain constant. There is a rule that aims to produce a constant radiographic quality by adding the exposure value, namely the 10 kV rule. This study was conducted to determine the noise in the computed radiography image with the thorax organ produced by modifying the exposure factor of the 10 kV rule and whether it is still within tolerance.Methods: This quantitative research was conducted with an experimental approach. This is done by taking a series of radiographs that include three exposure factor settings, standard (60 kV, 10 mAs), increased by 10 kV (70 kV, 5 mAs) and lowered by 10 kV (50 kV, 20 mAs). Noise measurement is done by doing ROI in the background area. The exposure index and deviation index values were also recorded as quality and dose references. The data was processed and analyzed by statistical tests.Results: From the statistical test results, there is a significant relationship between kV and noise with a sig (1-tailed) of ,000. Noise on the standard exposure factor has a lower noise than the modified exposure factor with a difference of 0.2. From the quality aspect, the most optimum exposure index and deviation index indicators are in the range of 70 KV and 5 mAs.Conclusion: The results of the statistical test of the relationship of kV to noise obtained at 50 Kv and 20 mAs, 60 kV and 10 mAs gave a significance value of 0.263 and 0.435, while at 70 kV and 10 mAs with Sig. (1-tailed) of .000 which means the relationship between kV to noise is strong because the sig value is below 0.05.

Background: MSCT Abdomen late arterial phase is a radiological examination to evaluated enhancement in hypervascular lesions, stomach, bowel, pancreas parenchyma, spleen and kidney outer cortex. All the structures get bloodsupply of the artery will show an optimal increase (Smithuis, 2014). Smithuis (2014) used time scan delay 15-20 seconds. However in the Abdomen MSCT examination in the late arterial phase of Radiology Hospital Dr. Kanujoso Djatiwibowo Balikpapan used  the different time scan delay. This study aimed to determine differences in contrast enhancement with time scan delay variation of contrast media and to determine the optimal time scan delay in the examination of the Abdomen  MSCT late arterial phase.Methods: The research type is quantitative experimental approach. Data are taken in October and November 2016. The research population of abdomen MSCT examination clinical intra-abdominal mass cases. Total sample are 18 people with a predetermined inclusion criteria. Time scan delay variation used  are 10 seconds, 15 seconds, 20 seconds. evaluated with  respondents the  data is processed with statistic analysis by using different test Kruskal-Wallis followed by post hock Mann-Whitney and to get the most optimal assessment visits of mean rank the Kruskal-Wallis test.Result: The results obtained p value 0,001 (p 0,05), there are  shown significant differences between time scan delay 10 seconds, 15 seconds, 20 seconds at Abdomen  MSCT examination in the late arterial phase of Radiology Dr. Kanujoso Djatiwibowo Balikpapan Hospital. An optimal time scan delay on Abdomen MSCT examination late arterial phase is 10 seconds premises ROI tracking on descenden aorta. From the results of tests conducted using the Kruskal-Wallis test values mean rank at the time scan delay of 10 seconds is 84,75.Conclusison: There is a difference significant anatomical image information between the time scan delay 10 seconds, 15 seconds, 20 seconds. on MSCT Abdomen examination artery in the late phase of Radiology  Dr. Kanujoso Djatiwibowo Balikpapan Hospital. assessment results are tested using the Kruskal-Wallis test followed Mann-Whitney post hock obtained p value 0.001 (p 0.05), meaning that there is a difference between the third anatomical image information  with time scan delay variations. Time delay optimal scan on  Abdomen MSCT examination late artery phase that time scan delay 10 seconds by tracking ROI on descenden aorta. From the results of tests conducted using the Kruskal-Wallis test values mean rank at the time scan delay of 10 seconds 84.75, 56.62 ie 15 seconds, 20 seconds, namely 22.12.

Background : Interslice gap is the distance between slices, usually its value is based on the percentage of slice thickness, interslice gap is one of the parameters that can affect the quality of MRI image. Rarely are radiographers willing and able to manipulate the value of the interslice gap, so it can produce a good image. The purpose of this study is, to determine the effect of interslice gap variation on quality on MRI brain pieces axial T1WI spin echo, to know the difference of interslice gap variation to anatomical image information on MRI brain T1WI spin echo axial, to know the value of interslice gap which has an optimal anatomical image information on MRI brain T1WI spin echo axial. Methods : This type of research is quantitative and qualitative with an experimental approach. The research was conducted at the General Hospital of dr. Sardjito Yogyakarta. The data were 32 images of MRI brain T1WI spin echo from the variation of interslice gap used 0%, 10%, 20%, and 30% from slice thickness 5 mm. The test was performed on image quality that was statistically analyzed by linear regression test. While for information of anatomical image analyzed with Friedman test, from friedman test can be known information of best anatomical image, seen from mean rank. Results : The results of this study indicate that there is an effect of interslice gap variation on quality on MRI brain of T1WI spin echo axial pieces, seen from p value of SNR (0.010) and CNR (0.001) <0.05. In addition there is influence, there is also differences in anatomical image information on MRI brain pieces axial T1WI spin echo, seen from p value that is 0.001 <0.05. seen from the mean rank interslice gap 10% has the best anatomical image information. Conclusion : There is an effect of interslice gap on image quality on MRI brain axial of T1WI spin echo, there is difference of MRI brain anatomical image information of T1WI spin echo axial with interslice gap variation, interslice gap 10% value has the most optimal information.