Background : This study aims to determine the differences in the quality of anatomical image information and to determine the best reconstruction variation of the Mastoid CT scan. Methods : The design of this study was quantitative and qualitative analysis, conducted in the radiology unit of Banten Hospital with the study population was all patients who underwent a head CT scan. The sample was taken using a purposive sampling technique specifically for the Mastoid CT Scan examination with clinical mastoiditis. Image reconstruction was performed with three variations of the filter, namely bone standard, bone smooth, and bone sharp for analysis. Result : The results obtained were that there were no significant differences in the SNR values of the three filter variations, but there were differences in the CNR values of the three filter variations. Conclusion : Based on the study conducted, it can be concluded that data obtained qualitatively according to clinical and the results of interviews with ENT specialists and radiologists that the bone sharp filter gets the highest rate which is used to analyze Mastoid CT images, and it is recommended to assess mastoid CT images with clinical mastoiditis.

Iterative reconstruction can optimize radiation dose and improve image quality on CT scan. This research method is quantitative analytic with the analysis of the results of the head CT examination parameters associated with image quality to changes in variations of 80 kV, 100 kV, 120 kV with the use of iterative reconstruction. Image quality measurements are the Hounsfield Unit (HU) value, standard deviation, and Signal to Noise Ratio (SNR) using Radiant Viewers. Effective dose measurement using the Dose Length Product (DLP). Then perform the Kruskal Wallis test to find out whether there is an effect of tube voltage and Iterative Reconstruction on the SNR value using IBM SPSS version 24. The results image quality of the HU value increase due to changes in the kV value, but the value does not change significantly when the iDose changes, for the standard The deviation has decreased due to changes in kV, but the value of the value does not experience a significant change at the time of change in iDose, while SNR increases due to changes in kV value and changes in iDose. The percentage ratio of the effective dose in the use of standard kV with 80 kV decreased radiation dose by 62%, while at 100 kV there was a decrease of 25%, and the use of 120 kV experienced an increase of 25%. The results of the Kruskal Wallis test p-value <0.001, therefore it can be concluded that there is a difference in the SNR image quality at each change in iDose and kV parameters.

A typical image of the Thorax CT Scan as a sign of the early stages and development of Covid-19 is the finding of Ground Glass Opacities (GGO). GGO is an insignificant increase in the density of the lungs without occlusion of blood vessels and bronchi. In mild cases, GGO tends to be difficult to identify and requires high-resolution CT scanning. In this study, we intend to improve the resolution of the Thorax CT Scan image through filter settings, to analyze the difference in the variations of filters B50s, B70s, and B90s towards the quality of the CT Scan image and obtain the optimal use of filter in the Thorax CT Scan examination among Covid-19 cases. This was a quantitative analytical study conducted at one of the Regional General Hospital in Jakarta on March-April 2022. The samples were secondary data derived from 10 patients by using MSCT Siemens Somatom Perspective 128 slices. Data were collected through observation and experiment. The images collected were further analyzed using Image j software to find values of Signal to Noise Ratio (SNR) and Contrast to Noise Ratio (CNR). Furthermore, the values were compared by assessing the anatomical image information through various filters. The results of this study indicated that there were differences in the SNR and CNR values of the three filters. The higher resolution of the filter used, the more capable it was to sharper and more detailed the image but the noise level was also higher. Thorax CT Scan examination should be carried out using the B70s very sharp filter that was able to produce images with the optimal information and fairly low noise level. A very thin GGO image in the early stage of the manifestation of Covid-19 could be identified in the Thorax CT Scan examinations for diagnosis of Covid-19 case.

Bakcground: The differences in fat suppression MR images between Proton Density Fat Saturated sequence with STIR sequence in MRI pedis sagital view. This research aims to analyze the differences of SNR, CNR, and the details MR images. Methods: Secondary data were using by non-probability sampling technique with 10 purposive sampling of pedis MR images Proton Density Fat Saturated sequence and STIR sequence sagittal view in DICOM were done by using imageJ software. The instrument of this research consisted of a worksheet and questionnaire. Result: This research showed SNR p value/sig 0,000 < 0,05 and CNR p value/sig  0,575 > 0,05. In Proton Density Fat Saturated sequence sagittal view the detail of ekstra-articular fluids value is 1,76, tendon Achilles value is 2,88, joint space value is 2,86 and bone marrow value is 2,04, contrast resolution value is 2,418, noise ratio value is 2,32. Pedis MR images of STIR sequence sagittal view the details of ekstra-articular fluids value is 2,92, tendon Achilles value  is 3,28, joint space value is 2,84 and bone marrow value is 3,4, contrast resolution value is 3,022 and noise ratio value is 2,44. Conclusion: There is a significant difference of SNR value, no significant differences in CNR value and value of MRI pedis sequence Proton Density Fat Saturated sagittal detail is clear enough to show tendon achiles, bone marrow,  joint space and not clear to show ekstra-articular fluids. STIR nice to show tendon achiles and bone marrow and clear enough to show ekstra-articular fluids and joint space.

Background : This research aims to analyze the information of genu axial section image quality using T2 STIR and SPAIR sequences at Mayapada Hospital. Methods : The design of this research is quantitative analytics with experimental approaches conducted at the Mayapada Hospital Radiology Installation with the study population taken from all MRI genu examination patients during September-December 2020 with a study sample of 5 patients aged 18-40 years with various complaints on Genu. Then, reconstruction is carried out with a stunt cut techniques on STIR and SPAIR sequence. Result : The result of this study showed a difference in T2 STIR d an T2 SPAIR with p value of 0.025 < 0.05. Conclusion : The contrast of MRI genu sequence STIR is brighter than SPAIR sequence as evidenced by the calculation of CNR value of STIR sequence 8,388 higher than SPAIR sequence value of 5,345. So it can be concluded that in MRI genu examination, the CNR value on the STIR sequence of a stunt pieces with SPAIR sequence of a stunt pieces has a significant difference.