MEDICAL IMAGING AND RADIOTHERAPY JOURNAL最新文献

{"title":"COMPARISON OF DIAGNOSTIC AND RADIOTHERAPY PLANNING PROTOCOLS IN LUNG CANCER TREATMENT","authors":"Filip Vlaj, V. Z. Marcius, Katja Škalic","doi":"10.47724/MIRTJ.2020.I02.A002","DOIUrl":"https://doi.org/10.47724/MIRTJ.2020.I02.A002","url":null,"abstract":"Purpose: The purpose of the study was to compare a standard diagnostic protocol for computed tomography imaging on a positron emission tomography scanner at the Department of Nuclear Medicine, and a radiotherapy imaging protocol for pre-planning needs in radiotherapy for lung cancer treatment, to determine the differences between these two protocols and to propose possible improvements in the dose optimisation for computed tomography imaging in a radiotherapy protocol. Methods: In this retrospective study, data were collected via the SyngoVia program and statistically analysed according to the patient dose load in computed tomography imaging in standard and radiotherapy protocols. The analysis encompassed data on a total of 56 patients in the period from 1 January 2017 to 1 December 2018. We compared data on patient dose load in computed tomography imaging in a standard protocol before and after the introduction of the improved sinogram-affirmed iterative reconstruction method (SAFIRE). Results and discussion: It was established that there are statistically significant differences in dose per patient (p<) in computed tomography imaging in standard and radiotherapy protocols. Statistically significant differences were also established in computed tomography imaging in the standard protocol before and after the introduction of the improved iterative reconstruction method (p=0,001). Dose load on the lung in computed tomography imaging was 67.5% lower in the standard protocol with the iterative reconstruction in image space (IRIS) method than in the radiotherapy protocol. The introduction of the improved SAFIRE method additionally lowered the dose per patient by 34.2% compared to the IRIS method. Conclusion: In the future, the introduction of the improved iterative reconstruction method is possible for the reconstruction of tomographic images, including for radiotherapy imaging protocol that takes into account the impact of the indirect reduction in the dose on the accuracy of the identification of tumour target volumes when planning radiation treatment for the patient. Key words: positron emission tomography with computed tomography, iterative reconstruction, dose optimization, lung cancer, radiation treatment planning","PeriodicalId":271343,"journal":{"name":"MEDICAL IMAGING AND RADIOTHERAPY JOURNAL","volume":"30 11-12","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120919580","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"ANODE HEEL EFFECT ATTENUATION IN LUMBAR SPINE RADIOGRAPHY: CAN THE USE OF ALUMINIUM FILTERS IMPROVE CLINICAL PRACTICE OF RADIOGRAPHERS?","authors":"L. Ribeiro, A. Abrantes, O. Lesyuk, Ruben Dores, Patrick Sousa, S. Rodrigues, Rui Almeida, Kevin Azevedo, J. Soares, J. Aleixo","doi":"10.47724/MIRTJ.2020.I02.A003","DOIUrl":"https://doi.org/10.47724/MIRTJ.2020.I02.A003","url":null,"abstract":"Purpose: The aim of this study was to design an aluminium-based filter to reduce the anode heel effect in lumbar spine radiographs. Methods: Initially, lumbar spine examinations were observed in a public imaging department to determine the standard exposure parameters. Then, the characterization of the anode heel effect was made using the Unfors Xi R/F detector and based on the data collected, aluminium filters were designed with a wedge shape, with thicknesses ranging from 0.1 to 4.0 mm. The assessment of the entrance skin dose (ESD) reduction was performed on the anthropomorphic phantom, with and without filters, using the universal dosimeter UNIDOS E equipped with an ionization chamber. Lastly, the image quality assessment was performed with the Pehamed Phantom Digrad A+K and image quality surveys were applied to radiographers and radiologists.     Results and Discussion: Uniformity of the beam was achieved, especially with the filter number 2, which presents a significant variation of 9% between cathode and anode side. This filter contributes to ESD reduction of 35% and 36% for AP and lateral projection, respectively. Also, according to the radiographers and radiologists, it improves the image quality of lumbar spine radiography. Conclusion: The use of aluminium filters can be advantageous in the clinical practice of radiographers when carrying out lumbar spine radiographs, since it allows to standardize the anode heel effect, reducing the radiation dose to the patient and without compromising the image quality.","PeriodicalId":271343,"journal":{"name":"MEDICAL IMAGING AND RADIOTHERAPY JOURNAL","volume":"142 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128119012","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"TWO CASES OF MRI-INDUCED SKIN BURNS","authors":"Gasper Podobnik","doi":"10.47724/mirtj.2020.i01.a002","DOIUrl":"https://doi.org/10.47724/mirtj.2020.i01.a002","url":null,"abstract":"Materials and methods: Both cases were imaged using a GE Optima™ MR450w 1.5T scanner. A combination of anterior and posterior arrays were used. In both cases, patients were placed in the headfi rst prone position. Results and discussion: In the fi rst case, there was a red area on the skin and a white blister appeared after 15 minutes. A closed conducting loop was created in the patient’s body, which caused increased local temperature at the junction of her thighs. We could prevent this by using insulation, such as foam pads, which is one of eight steps for preventing MRI-induced skin burns. In the second case, there were red spots on the skin of the left and right thighs at the contact of the scrotum where a white blister appeared after 15 minutes. This could not have been prevented, even if we considered all the steps for preventing MRI-induced skin burns. Conclusion: I reported a case of burns on a small area of skin at the junction of the patient’s thighs, which we could have prevented by using insulation pads, and a case of burns on the skin at the contact of the scrotum, which we could not have prevented, even if we considered all the steps for preventing MRI-induced skin burns. However, we could have stopped the increase in the degree of the burn by recognising early signs.","PeriodicalId":271343,"journal":{"name":"MEDICAL IMAGING AND RADIOTHERAPY JOURNAL","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130212198","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"IMPACT OF ACQUISITION PARAMETERS ON THE QUANTITATIVE ASSESSMENT OF PET IMAGING – ANALYSIS OF THE NEMA PHANTOM","authors":"S. Rep","doi":"10.47724/mirtj.2020.i01.a005","DOIUrl":"https://doi.org/10.47724/mirtj.2020.i01.a005","url":null,"abstract":"Aim: The aim of the research was to analyse the most common factors that influence SUV values. Material and methods: In the study, I used a NEMA body phantom filled with a mixture of water and 18F-FDG in a ratio 1:4 (background/spheres), and analysed the most common factors that influence SUV values. The most common factors include the impact of the patient's body weight, the impact of time between application and PET/CT imaging, and the impact of differently prepared and administered RP activities. Results: Different values of patient body weight, time between application and PET/CT imaging, and differently prepared and administered RF activities have a statistically significant effect on the quantitative assessment of SUVmax (p < 0.001) and SUVmean (p < 0.001). Conclusion: The results showed that all factors can significantly influence the quantitative assessment of SUVmax and SUVmean.","PeriodicalId":271343,"journal":{"name":"MEDICAL IMAGING AND RADIOTHERAPY JOURNAL","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132728435","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"MAGNIFICATION ERROR IN RADIOGRAPHS OF CERVICAL SPINE IN LATERAL PROJECTION","authors":"A. Cesar, Manca Grkman, M. Medič, Zdravstvena pot Ljubljana Slovenia Radiotherapy","doi":"10.47724/mirtj.2020.i01.a003","DOIUrl":"https://doi.org/10.47724/mirtj.2020.i01.a003","url":null,"abstract":"Purpose: The main purpose of this study was to determine how the distance between the cervical spine and the image receptor on the one hand and the distance between the source and the image receptor on the other aff ects the image size of the cervical vertebrae. Moreover, it was important to understand how the entrance skin dose varies when the distance between the object to image receptor and the distance source to image receptor changes. Methods: The theoretical part of this study was carried out based on an analysis of the readings, the practical part was carried out on a head, neck and trunk phantom at the radiological laboratory of the Faculty of Health Sciences (University of Ljubljana). Results: When the object to image receptor distance (OID) was increased from 24 to 39 cm, the image size of the vertebra increased by 23% at a source to image receptor distance (SID) of 115 cm. At an SID of 150 cm, it increased by 17% and by 11% at an SID of 180 cm. When SID was decreased from 150 to 115 cm at an OID of between of 24 and 29 cm, the entrance skin dose increased by 26%. As the OID was increased further, the entrance skin dose (ESD) was even higher. Similarly, the ESD decreased with an increase in SID. For example, when SID was increased from 150 to 180 cm at an OID of between 24 and 29 cm, the ESD decreases by 8.5%. Discussion and conclusion: The results indicate that the lateral radiography of the cervical spine should be performed at a SID of 150 cm. By doing so, it is assured that a proper image size is obtained, and the entrance skin dose is not harmful to the patient.","PeriodicalId":271343,"journal":{"name":"MEDICAL IMAGING AND RADIOTHERAPY JOURNAL","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124571617","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}