Vpliv dodatne bakrene filtracije pri slikanju abdomna : magistrsko delo

Pavić, Maja (author), Mekiš, Nejc (mentor), Alukić, Erna (comentor), Dolenc, Laura (comentor), Škrk, Damijan (reviewer)

Uvod: Slikanje abdomna je klasificirano kot preiskava, kjer pacient prejme relativno veliko dozo ionizirajočega sevanja za pridobitev slik v notranjosti trebušne votline. Dozo lahko zmanjšamo s pravilno izbiro ekspozicijskih pogojev, pravilnim zaslanjanjem slikovnega polja, uporabo filtracije ter pravilno projekcijo. Namen: Namen dela je ugotoviti, kakšen je produkt doze in površine slikovnega pola (DAP), vstopna kožna doza (VKD), efektivna doza (E) in doza na izbrane organe pri slikanju abdomna z različnimi debelinami bakrene filtracije (0 mm, 0,1 mm, 0,2 mm in 0,3 mm). Prav tako pa je namen ugotoviti ali debelina filtra vpliva in spremeni kakovost slike. Metode dela: Raziskavo smo izvedli v dveh delih. V prvem delu raziskave smo merili DAP, VKD, E, kakovost slike na fantomu, kjer smo naredili 5 slik za vsako skupino bakrene filtracije – skupaj 20 slik. Drugi del raziskave smo izvedli na 200 pacientih, ki so bili napoteni na rentgensko slikanje abdomna v Splošni bolnišnici Slovenj Gradec. Pri vseh pacientih smo beležili maso in višino za izračun indeksa telesne mase (ITM), DAP, VKD, E in dozo na izbrane organe, ter vse navedene parametre primerjali glede na stopnjo dodatne bakrene filtracije. Vse rentgenograme so na koncu neodvisno ocenili še trije specialisti radiologi zaposleni v Splošni bolnišnici Slovenj Gradec. Rezultati in razprava: Raziskava je pokazala da statistično značilnih razlik v DAP meritvah tako na fantomu kot na pacientih ni, prav tako ni bilo statistično značilnih razlik pri izračunu VKD. Pri meritvah efektivne doze na fantomu smo ugotovili statistično značilne razlike (p=0,046), medtem ko statistični značilnih razlik na pacientih ni (p=0,108). Povprečna absorbirana doza na vranici (p=0,021), ledvici (p=0,007), nadledvičnici (p=0,016) in kostnem mozgu (p=0,029) je višja oziroma so statistično značilne razlike pri uporabi različno debelih bakrenih filtrov. Med ocenjevalci pri oceni kakovosti slik ni bilo statistično značilnih razlik. Zaključek: Rezultati so pokazali, da ni statistično značilnih razlik pri nobenem od merjenih parametrov, razen pri nekaterih navedenih organih. Vpliv dodatne bakrene filtracije v našem primeru ne vpliva na prejete doze na pacientih in kakovost slik, kar je verjetno posledica večje razdalje gorišče-slikovni sprejemnik.

• Language: Slovenian
• Keywords: magistrska dela, radiološka tehnologija, slikanje abdomna, bakrena filtracija, zmanjšanje doze, kakovost slik
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: ZF - Faculty of Health Sciences
• Place of publishing: Ljubljana
• Publisher: [M. Pavić]
• Year: 2024
• Number of pages: 53 str., [4] str. pril.
• PID: 20.500.12556/RUL-163723
• UDC: 616-07
• COBISS.SI-ID: 211223043
• Publication date in RUL: 10.10.2024

Secondary language

• Language: English
• Title: The effect of additional copper filtration in abdominal imaging : master thesis

Abstract

Introduction: Abdominal imaging is classified as an examination where the patient receives a large increase in ionizing radiation to obtain an image of the interior of the abdominal cavity. The dose can be reduced by the correct choice of exposure conditions, the correct shielding of the image field, the use of filtration and the correct projection. Purpose: The aim is to determine what the product of dose and image pole area (DAP), entrance skin dose (VKD), effective doses (E) and doses to organs are when imaging the abdomen with different thicknesses of copper filtration (0mm, 0.1mm, 0.2mm and 0.3mm). It is also intended to determine whether the thickness of the filter affects and changes the quality of the image. Methods: We conducted the research in two parts. In the first part of the research, we measured DAP, VKD, E, image quality on the phantom, where we took 5 images for each group of copper filtration - a total of 20 images. The second part of the research was conducted on 200 patients who were referred for abdominal X-rays. In all patients, weight and height were recorded for the calculation of body mass index (BMI), and at the same time we also compared DAP, VKD, E, dose to organs. At the end, all radiographs were independently evaluated by three specialist radiologists employed at Slovenj Gradec General Hospital. Results and discussion: The research showed that there were no statistically significant differences in the DAP measurements both on the phantom and on the patients, and there were also no statistically significant differences in the VKD calculations. When measuring the effective dose on the phantom, we found statistically significant differences (p=0.046), while there were no statistically significant differences on the patients (p=0.108). The average absorbed dose on the spleen (p=0.021), kidney (p=0.007), adrenal gland (p=0.016) and bone marrow (p=0.029) is higher or there are statistically significant differences when using different thick copper filters. There were no statistically significant differences between raters in the assessment of image quality. Conclusion: The results showed that there were no statistically significant differences in any of the measured parameters, except for the mentioned organs. The effect of additional copper filtration in our case does not affect the doses received by the patients and the quality of the images, which is presumable the effect of higher source to image receptor distance.

• Keywords: master's theses, radiologic technology, abdominal imaging, copper filtration, dose reduction, image quality