Na fantomu simulirana meritev in modelna napoved ocene tveganja v primeru klasičnega slikanja abdomna nosečnice

Vajsbaher, Jelka

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Title:	Na fantomu simulirana meritev in modelna napoved ocene tveganja v primeru klasičnega slikanja abdomna nosečnice
Authors:	ID Vajsbaher, Jelka (Author) ID Fajmut, Aleš (Mentor) More about this mentor... ID Dobovišek, Andrej (Comentor)
Files:	MAG_Vajsbaher_Jelka_2017.pdf (1,03 MB) MD5: 332D207B5477CF23C5AFDD9E8BE97DB7
Language:	Slovenian
Work type:	Master's thesis/paper
Typology:	2.09 - Master's Thesis
Organization:	FZV - Faculty of Health Sciences
Abstract:	V okviru magistrskega dela smo na fantomu simulirali klasično rentgensko slikanje abdomna ženske, pri čemer smo meritve doz izvedli pri različnih izbirah parametrov slikanj glede na debelino trupa preiskovanke, in podali modelno napoved prejete doze abdomna. Glavni namen magistrskega dela je namreč bil oceniti tveganje, ki bi ga tako klasično rentgensko slikanje v področju abdomna nevede noseče ženske potencialno povzročilo plodu. Pri slikanju abdomna namreč uporaba svinčenih zaščitnih sredstev v področju maternice in jajčnikov ni možna, saj mora biti na rentgenski sliki prikazana celotna trebušna votlina od prepone pa vse do zgornjega roba sramnične zrasti. Osredotočili smo se le na slikanje abdomna AP (antero/posterior) leže, ki je tudi osnovna projekcija za slikanje trebušnih organov. V eksperimentu smo uporabljali fantom iz polimetilmetakrilatnih plošč, ki je služil za simulacijo preiskovank z različnimi telesnimi konstitucijami. Različne širine preiskovank smo simulirali z različnim številom plošč v fantomu, pri čemer smo s termoluminiscenčnimi dozimetri merili vstopno in izstopno dozo. Pri eksperimentu smo uporabili digitalni rentgenski aparat AXIOM MULTIX MT, ki ima nameščen polprevodniški slikovni detektor CANON CXDI-C. Absorbiranih doz v abdomnu nismo samo izmerili, temveč smo jih tudi napovedali z modelom in jih primerjali z izmerjenimi. Ugotovili smo, da model napove zelo primerljive doze, kot so tiste, izmerjene na fantomu, iz česar lahko sklepamo, da je tak model ustrezno orodje za napoved doz pri klasičnem slikanju abdomna noseče ženske. Rezultati modela in meritev tudi pokažejo, da so doze pri tovrstnem slikanju približno desetkrat manjše od tistih, pri katerih korist še odtehta tveganje in ki predstavljajo deterministično tveganje za razvoj ploda. (ICRP, 1987).
Keywords:	Rentgensko slikanje, dozimetrija, model, simulacija, fantom, nosečnost
Place of publishing:	Maribor
Publisher:	[J. Vajsbaher]
Year of publishing:	2017
PID:	20.500.12556/DKUM-64966
UDC:	621.386:004.358(043.2)
COBISS.SI-ID:	2315940
NUK URN:	URN:SI:UM:DK:G8DDCZ6K
Publication date in DKUM:	10.04.2017
Views:	2142
Downloads:	251
Metadata:
Categories:	FZV
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Secondary language

Language:	English
Title:	Phantom-Based measurements and model predicted risk assessements for the x-ray imaging of the abdomen of a pregnant woman
Abstract:	In the present study, a phantom was used to simulate the classical X-ray imaging of the abdominal area of a woman and the doses were measured for different values of the imaging parameters. The parameters were selected according to the body thickness. The absorbed dose of abdomen was determined also by the model. The main purpose of this study was to assess the potential risk of such X-ray imaging to a foetus of an unknowingly pregnant woman, especially, as imaging of the abdomen does not allow for the lead protection, as that would prevent a clear view of the entire abdominal cavity from the diaphragm all the way to the upper edge of the symphysis pubis. In this study we focused merely on taking an image (anterior/posterior) of the abdominal area from the supine position, following the basic orientational projection of the abdominal organs. In the experimental setup, a polymethylmethacrylate panel phantom was used to simulate the patient with different physique. Different thicknesses of the patients' body were simulated with a different number of plates within the phantom. Thermo-luminescent dosimeters were placed under and on top of the phantom, which allowed direct measurement of both the inlet and the outlet doses. A digital X-ray apparatus AXIOM MULTIX MT with an installed solid-state detector CANON CXDI-X was used for imaging. Absorbed doses within the abdomen were not only measured but also predicted by the model and compared with the measured ones. We found out that the model predicts the doses that are in good agreement with those measured on a phantom. According to that we may conclude that the model represents an appropriate tool for the prediction of absorbed doses for the case of classical X-ray imaging of the abdomen of a pregnant woman. Moreover, the results of the model and the measurements also indicate that absorbed doses, for which benefit still outweights the risk of this kind of imaging, are approximately ten times smaller than those that would represent a deterministic risk for the foetus development. (ICRP, 1987).
Keywords:	X-ray imaging, dosimetry, model, simulation, phantom, pregnancy

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