Latar Belakang: Pesawat CT Scan single slice Merk SIEMENS/Dura 302 MV di unit Radiologi Rumah Sakit Umum Semara Ratih Kabupaten Tabanan Bali terpasang pada bulan Nopember 2020 merupakan alat second hand dengan tahun produksi 2012. Pelaksanaan kendali dilakukan pada saat penerimaan (acceptance test) meliputi pengujian terhadap indeks dosis  CT (CTDI) untuk  kepala, indeks dosis  CT (CTDI untuk badan, CT-Number udara, kesesuaian table slice dengan setting semua slice, indikator posisi meja (sumbu z), laser penanda dan pada bulan april 2021 yang dilakukan oleh Badan Pengawas Fasilitas Kesehatan (BPFK) Surabaya meliputi uji teknis generator dan tabung sinar-X (uji akurasi tegangan tabung, uji kualitas berkas sinar-X), uji kualitas citra (uji akurasi CT number air, keseragaman CT number), dan pelaksanaan kendali mutu rutin peralatan radiologi jarang dilaksanakan secara berkesinambungan untuk menjaga kinerja pesawat CT Scan. Metode penelitian: kualitatif deskriptif dengan pendekatan survey. Hasil dan Pembahasan: Pengujian yang telah dilakukan diperoleh nilai rata rata CT number untuk water phantom pada lima posisi yang berbeda adalah -1,68; -0,76; -2,21; -1,77; -1,53 HU dan semua berada pada rentang nilai toleransinya yaitu -4 sampai 4 HU. Pengujian Dry laser printer dengan dengan hasil sebagaian besar masih sesuai parameter uji yang berlaku, hanya pada pattern 0% terdapat nilai uji yang melebihi standar artinya quality control untuk Dry laser printer di Unit Radiologi RSU Semara Ratih tidak sasuai dengan standar sehingga di perlukan kalibrasi. Pada Pengujian form check list yang telah dilakukan di Unit Radiologi RSU Semara Ratih untuk mengetahui ada tidak nya  tombol alat yang tidak berfungsi dengan hasil semua fungsi dan tombol masih berfungi dengan baik. Kesimpulan: Hasil uji kesesuaian pada Pesawat CT Scan single slice Merk SIEMENS/Dura 302 MV di unit Radiologi Rumah Sakit Umum Semara Ratih Kabupaten Tabanan Bali dalam batas normal kecuali pada dry laser printer.

Background: Technological developments, especially in the field of radiology, is growing rapidly. The radiology quality assurance system has also developed, one of which is the Collimator Test Tools. The method of testing x-ray beams using this tool has also been developed, such as using film and using IP. However, the development of this method has a drawback, namely that the examiner is required to have special skills in image post-processing. The development of Collimator Test Tools by utilizing the nature of x-rays which causes certain substances such as calcium tungstate or zinc sulfide to glow light (luminance) has been done a lot, but there is no study of these products. Therefore, the researcher wants to develop a product by designing a Collimator test tool based on digital image analysis technology (Dev-X) and a digital camera with Android-based calculations on a wirelessly connected smartphone as an update of the testing method. Objective: To create a collimator test tool for x-ray machines based on digital image analysis technology (Dev-X). Methods: This is a research experiment with a posttest group only design type. Research Location at the Radiology Laboratory of the Radiodiagnostic and Radiotherapy Engineering Academy (ATRO) Bali. Result: Functional Test of Dev-X Products (hardware and software), all components function properly. However, it cannot be assessed significantly from statistical results. Conclusion: The creation and proper functioning of hardware and software tools collimator test tool Dev-Xon android smartphone and show the calculation results of the x-ray beam automatically.

Background : Computed Tomography (CT) scanner is an imaging tool used to obtain images of certain parts of the body using X-rays. CT-Scanner more detailed image, compared to X-ray, CT Number is the value of the X-ray attenuation coefficient (energy attenuation) determined by the average X-ray calculated in Hounsfield Units (HU) which is a standard facility that always is on the CT-Scan plane. Thorax CT-Scan is a radiological examination technique to obtain anatomical information of cross-sectional slices such as axial, coronal and sagittal. Coronavirus Disease 2019 (Covid-19  ) is an infectious disease caused by a species of coronavirus, namely severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). As a recent study, the CT-Scan abnormality that is most often observed in Covid-19  patients is ground glass opacity (GGO). Methods : This research uses descriptive quantitative with an observational approach. This measurement uses the Region Of Interest (ROI) to determine the value of the CT Number, where the Region Of Interest (ROI) is directed at the picture that contains a pathological abnormality of Grond Glass Opacity (GGO) on the CT-Scan Thorax in cases of Covid-19  then the CT Number value is compared with results of research conducted by Ali & Ghonymy, (2020). Result and Coclusion : Shows that there is a range of CT Number values ​​using quartile 3 or 75% percintile with the result of : -167 HU, Maximum : -74 minimum value : -288 HU. This means that it is a pathological Grond Glass Opacity (GGO) for Covid-19  patients.