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Analisis Image Noise dan Dosis pada Pemeriksaan MSCT dengan Menerapkan Aplikasi Piranti Lunak Care Dose Pesawat Siemens Somatom 6 Slice di RSUD Prof. Dr. Margono soekarjo purwokerto Lutfatul Fitriana; Gatot Murti Wibowo; Sudiono Sudiono
Jurnal Imejing Diagnostik (JImeD) Vol 2, No 1: January 2016
Publisher : Poltekkes Kemenkes Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31983/jimed.v2i1.3167

Background: Multi-Slice Computed Tomography (MSCT) is diagnostic radiology examination that take an advantage of computer to acquire data and reconstructing an Image from number of detector rows. Noise is one of the tremendous factors that affect the quality of CT Images. Nowadays, CT mAs auto setting, an automatic exposure device, resolves such the Noise problems in which maintains the quality of diagnostic Images for all parts of the body with a lowest possible dose. Since working devices based on the size of the patient's body attenuation automatically, reduction of radiation dose by 40% to 50% would be achieved. Yet, the larger patient’s body parts, the higher patient’s CTDIvol occurrence, which in turn affects on the Noise produced. The purpose of this research is to define the difference in the value of Image Noise and dose whenever the MSCT procedure is employed with and without the auto mAs selection with regards to maintaining CTDIvol and Image Noise.Methods: This research was an experimental quantitative study with one shot case study and post-test only approaches. Data were collected on July 2016 in Radiology Unit of Prof. Dr. Margono Soekarjo Purwokerto Hospital. Noise values was measured on 20 mm region of interest (ROI) and the dose was calculated by the CTDIvol on the workstation monitor were collecting data from the head, thorax and abdomen water phantom of CT Images. Data was analyzed by SPSS 16 software using statistical tests of the paired t-test.Results: The results of this study statistically deemed significant as there were differences in Image Noise values such as head, thorax and abdomen water phantoms (value ρ - value 0.05). Similarly, figures about the CTDIvol comparison also showed different dose levels received by the phantoms when apply the CT procedures with and without auto mAs selection to the head, thorax and abdomen water phantoms (the head phantom: 50.69 mGy Vs. 60.28 mGy; the thoracic phantom: 3.88 mGy Vs. 7,98 mGy; and the abdomen phantom: 8.38 mGy Vs. 20.83 mGy respectively). Conclusion: There was a difference in production of the Image Noise and dose when apply the CT procedures with and without auto mAs selection to the head, thorax, and abdomen water phantoms. Lower dose tended to induce more Noise than higher dose, meanwhile patient’s dose leads to increase as well.

Penghitungan Volumetrik Perdarahan dengan Metode Volume Automatik (Software Volume Evaluation) dan Metode Manual (Broderick) pada MSCT Kepala (Study Eksperimen pada Pasien Perdarahan Intraserebral di RS. Haji Surabaya) Agus Setyo Kiswoyo; Gatot Murti Wibowo; Widiana Ferriastuti
Jurnal Imejing Diagnostik (JImeD) Vol 3, No 2: July 2017
Publisher : Poltekkes Kemenkes Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31983/jimed.v3i2.3190

Background : Intracerebral hemorrhage (ICH) is the brain parenchyma bleeding. The volume of intracerebral hemorrhage can affect mild to severe clinical symptoms due to increased intracranial pressure and it has a high risk of death. In addition, CT scan CTScan is a gold standard on PIS examination. Methods : This was a quantitative research with experimental approach. There are two methods of volumetric hemorrhage calculation, namely automatic and manual method. Automatic Volume Method (SVE) is a volume calculation by computer software available on CT Scan tool with voxel calculation in HU value range. The manual method (Broderick) used is AXBXC/2 which is the multiplication of length (A), width (B) and height/thickness of bleeding slice (C) divided by 2. From the result, the volume differencewas tabulated and measured, then the normality and different test were done.Results : The sample consisted of 10 new bleeding patient data which then classified into small hemorrhage group, calculated volumes automatic(SVE) and manual(Broderick). volume calculations obtained different values of volume ranging from 0.37 cm³ to 10.01 cm³, the percentage ranged from 3% to 41%. The result showed a very significant difference value due to the different test Paired Samples T Test with significance value of 0.001 (p-Value 0.05). From the data, 8 patients with different percentage above 20%,with average 25% were PIS with irregular shape. And 2 patients with volume difference below 10% with average 6 % were Intracerebral Hemorrhage regular shape. Conclussions : There is a difference in the calculation of volumetric Intracerebral hemorrhage between the automatic volume method (SVE) and the manual method (Broderick). With a percentage average difference of average volume of 6% for regular shapes and 25% for irregular hemorrhage.

Analisis Pemilihan Region of Interest (RoI) pada Magnetic Resonance Spectroscopy (MRS) Anita Nur Mayani; Gatot Murti Wibowo; Darmini Darmini
Jurnal Imejing Diagnostik (JImeD) Vol 2, No 2: July 2016
Publisher : Poltekkes Kemenkes Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31983/jimed.v2i2.3172

Background: Magnetic Resonance Spectroscopy (MRS) is an advance examination of MRI which produces a spectra describes metabolic information of tissues. ROI setting was very important in producing the spectra with diagnostic value that called Full-Width at Half Maximum (FWHM). In clinical applications, Radiographers select several ROIs in obtaining FWHM values without any specific benchmark which in turn directly affects on the accuracy of staging brain tumor. This study aims to examine the FWHM profiles based on the ROI selections, and to determine the effect of selected ROIs to FWHM values.Methods: This research was a quantitative study with an experimental approach. Data were assessed by an expert Radiographer during a period of 30 days on June 2016 in Radiology Department of Siloam Kebon Jeruk Jakarta Hospital using a specific bottle phantom MRI 2000 ml. The phantom was scanned with 1.5 Tesla MRI scanner, wuth various selection of the ROIs sized 20 mm, 25 mm, 30 mm, 35 mm and 40 mm at the centre position, 12 o'clock position, 3 o'clock position, 6 o'clock position and 9 o'clock position. Data was analyzed using linier regression test of SPSS V.16 software. The confident interval of influence of the ROI size in producing FWHM values was 95%.Results: The results showed the optimum FWHM values, 12-20, produced from the ROI size of 20-30 mm at the centre position. Regression analysis showed significant result (p-value 0.05), which was null hypothesis was rejected. It can be concluded that the ROI size setting effected on the resulted FWHM values. The smaller ROI size, FWHM value will decrease with higher homogeneity and vise versa.Conclusion: Optimum FWHM value was produced by ROI size of 20 – 30 mm at the centre position. There was influence of ROI size setting to FWHM value.

Kualitas Citra CT Abdomen Non Kontras Berdasarkan Variasi Rotation Time (Studi Penelitian dengan Menggunakan Phantom) Dyah Arum Larasati; Gatot Murti Wibowo; Sri Mulyati
Jurnal Imejing Diagnostik (JImeD) Vol 3, No 1: January 2017
Publisher : Poltekkes Kemenkes Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31983/jimed.v3i1.3182

Backgroud: Has conducted research in Radiology Department of RS Telogorejo Semarang regarding image quality of CT Abdomen non contrast based on variations of rotation time in phantom, especially noise and spatial resolution. This study was conducted to determine the difference in rotation time variation of the image quality (noise and spatial resolution) on a non-contrast CT abdomen and know the value rotation time is used in order to produce optimal image quality with the variations of the rotation time of 0.5 s, 0, 6 s, 0.7 s, 0.8 s, 0.9 s and 1.0 s.Methods: This research is a quantitative study with an experimental approach. Data have been collected from December 2016 to January 2017 in Radiology Department of RS Telogorejo Semarang. CT abdomen non-contrast examinations performed by using the modality of 64 slice CT scan and the data collected by assessing noise and spatial resolution in phantom. Further, data were tested with data normality test then the statistical test by Kruskal Wallis test has been used to determine the difference in image quality was noise and spatial resolution on non-contrast abdominal CT followed by Post Hoc test Mann Whitney on spatial resolution to determine a significant difference between the variation of rotation time .Results: The results of this study showed significant differences in spatial resolution with p value 0.001 and there were no significant difference in the value of noise with p value 0.001 non-contrast abdominal CT.Conclusion: Values optimal rotation time for CT Abdomen non contrast with variation of the rotation time are 0.5 s, 0.6 s, 0.7 s, 0.8 s, 0.9 s and 1.0 s for the spatial resolution is 0.6 s and 1.0 s for the noise.

Analisis Perubahan kV dan mAs terhadap Kualitas Gambar dan Dosis Radiasi pada Pemeriksaan Multislice Computed Tomography Abdomen dalam Kasus Tumor Abdomen di Instalasi Radiologi RSUD dr. Saiful Anwar Malang Ardi Soesilo Wibowo; Gatot Murti Wibowo; Anang Prabowo
Jurnal Imejing Diagnostik (JImeD) Vol 2, No 1: January 2016
Publisher : Poltekkes Kemenkes Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31983/jimed.v2i1.3170

Backgroud: Examination of the abdomen CT scan is often done by using standard protocol, meanwhile the actual parameter can be modified according to local needs considering image quality and radiation dose based on Karabulut and Ariyuek (2016). Abdomen CT Scan by GE 16 slices unit in Radiology Instaallation of Dr. Saiful Anwar Malang Hospital, using exposure factor of 120 kV, 234 mAs and the value of the CTDI dose was 53.04 mGy. While the BAPETEN’s reference of CTDI value, a CT scan of abdomen was 25 mGy. This study aims to determine the changes of the value of kV and mAs to the image quality and the radiaton dose in the abdomen MSCT examination on abdominal tumor case in Radiology Installation of Dr. Saiful Anwar Malang Hospital.Methods: This research was a quantitative research with an experimental approach. The data were collected from three variations of tube voltage (kV) ie 100 kV, 120 kV and 140 kV and three variations of tube current value and time (mAs) ie, 180 mAs, 195 mAs, and 210 mAs. Radiographs was evaluated by three radiology physicians. Data were analyzed by scoring method of respondent’s assessment to assess MSCT image quality of abdominal tumor, while the radiation dose was obtained by CTDI recording.Results: The results showed that there was influence of tube voltage variation to image quality of abdominal tumor using MSCT unit. The higher kV used, the higher image quality resulted. From the calculation of the percentage from the assessment, the highest score of variation was at 140 kV, while the lowest score of variation was at 100 kV. Based on the recording CTDI radiation dose on the monitor, found that the higher value of kV, the higher radiation resulted. The mAs variations influenced the image quality of abdominal tumor using MSCT unit. Acoording to the percentage of the assessment, the highest score of variation found in 210 mAs, and the lowest score of variation found in 180 mAs. Based on the recording of radiation dose on the monitor, the higher mAs value, the higher radiation dose using MSCT unit. It was recommended to use 195 kV and 120 mAs for MSCT examination of abdominal tumor in Radiology Installation of Dr. Saiful Anwar Malang Hospital.Conclusion: There was influence of kV and mAs variation to anatomical image clarity and radiation dose of abdomen MSCT examination

Penerapan Teknik Parallel Imaging Pada Pesawat MRI 0,35 Tesla Untuk Optimalisasi Kualitas Informasi Anatomi Pada MRI Lumbal Pembobotan T1WI dan T2WI Potongan Sagital Gatot Murti Wibowo; Dartini Dartini; Hari Prayitno
Jurnal Imejing Diagnostik (JImeD) Vol 1, No 1: January 2015
Publisher : Poltekkes Kemenkes Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31983/jimed.v1i1.3146

Background : Parallel imaging is one of the MRI Scanning techniques used to reduce the overall scan time when the patients with unvoluntary movement being examined with a low magnetic field of 0,35 T. This research aims to determine the difference between the clinical image quality of the conventional turbo spin echo (TSE) with mSENSE and that of the TSE with GRAPPA parallel imaging techniques from which resulting the MRI T1 and T2 Weighted Images (T1WI and T2WI) sagittal view of lumbar spines, and to define the techniques that clinically provide the most approriate anatomical information.Methods : This experimental study is made performed by the MRI 0.35 T in which 10 patients who had hernia nucleus pulposus (HNP) desease participated in the experiments ramdomly. The appointed Radiologists blended in the image evaluation using an image checklist to assess the visualisation of anatomical organs on the resulted sagittal lumbar MRI T1WI and T2WI. The two non-parametric statistical tools, Friedman test and the post hoc Wilcoxon matched pairs test, is used to analyze all the data descriptively. Testing the resesearch hypotheses with 95% of confident interval is to proved the differences between resulted sagittal lumbar MRI T1WI and T2WI..Results : The results shown there is a significant difference on the image quality of anatomical information when conventional TSE, parallel imaging-mSENSE and -GRAPPA, with T1WI are applied in the imaging techniques. When those imaging techniques are employed to obtain T2WI, the result is not significant in contrast.Conclusion : Good imaging techniques with adequate clinical image quality are ranked sequently as the conventional TSE, the mSENSE and GRAPPA.

Analisis Informasi Anatomi antara Sekuens T2WI FSE dan Proton Density Fat Saturation pada Pemeriksaan MRI Knee Joint Potongan Sagital (Studi pada Anterior Cruciate Ligament (ACL) dan Posterior Cruciate Ligament (PCL)) Atina Izzah Kusumaningrum; Lidya Purna WS Kuntjoro; Gatot Murti Wibowo
Jurnal Imejing Diagnostik (JImeD) Vol 2, No 2: July 2016
Publisher : Poltekkes Kemenkes Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31983/jimed.v2i2.3180

Background: There are clinical situations that radiology physicians need to assess Anterior Cruciate Ligament (ACL) and Posterior Cruciate Ligament (PCL) clearly with the two typical sequences (T2WI FSE sequence and Proton Density Fat Saturation). However, a slight difference in using the applied sequences will result different levels of image quality information. The aim of this study is to compare clinical manifest in anatomical information on the resulted images between T2WI FSE sequence and Proton Density Fat Saturation and to define the best sequence that fit to reveal ACL and PCL of the knee joint..Methods: The research was an experimental quasy. 20 sagital slices of the knee jointMRI were acquired from 10 volunteers who underwent MRI examinations with the two methods (T2WI FSE and Proton Density Fat Saturation). 3 experienced radiology physicians blended in the image scoring when review ACL and PCL appearances on knee MRI images. Inter-observer suitability was checked with Kappa test. A non-parametric Wilcoxon analyses was the statistical tool to test the null hypothesis.Results: The result showed a significant difference in anatomical information of ACL and PCL when T2WI FSE and Proton Density Fat Saturation sequences applied on the MRI of the knee jointsagital slices (p-value 0,05). The mean rank of T2WI FSE was better than Proton Density Fat Saturation which contributed to the value at 4,50. There was an increase in signals that lead to ACL and PCL appear to be more hyper-intens compared to sorrounding organs in general, except the border line of PCL. By this means, it was useful for evaluating the patient whose particularly with ACL post-grafting.Conclusion: There was the difference in anatomical information between T2WI FSE sequence and Proton Density Fat Saturation on MRI knee jointwith sagital slices for ACL and PCL studies. T2WI FSE sequence was the best method for showing anatomical information of ACL and PCL, although a relative low signal still occured from border line of PCL.

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