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National Repository of Grey Literature 3 records found  Search took 0.00 seconds. 
Iodine 131 Accumulation in Thyroid Remnant after Strumectomy in Thyroid Carcinoma: Comparison of Scintillation Probe and Scintillation Camera
 SVOBODA, Štěpán
The aim of the study was to compare the accumulation of 131I in the rest of the thyroid gland after strumectomy in thyroid carcinoma by scintillation probe and on a scintillation camera. In the practical part I deal with the research question: "Is the accumulation of iodine 131 in the rest of the thyroid gland measured by a scintillation probe significantly different from the measurement on a scintillation camera?" and the null hypothesis: "The values of iodine 131 accumulation measurements do not differ depending on the scintillation camera and scintillation probe measurements." The observed accumulation in the scintillation camera and the scintillation probe was analyzed by one way ANOVA, or one-way analysis of variance, which answered the question of whether the 131I accumulation measurements on the scintillation probe and on the scintillation camera differed. Finally, the research question was answered, confirmed by the additional hypothesis stated above in this chapter. The results of this work can be used in the following practice in the field of measuring 131I accumulation.
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Daily test of the AXIS scintigraphic camera quality in the Nuclear Medicine Department in Pribram as an indicator of the apparatus stability for the last 5 years
 HEFKA, Pavel
Daily test of the AXIS scintigraphic camera quality in the Nuclear Medicine Department in Pribram as an indicator of the apparatus stability for the last 5 years This Thesis is devoted to the choice of the most suitable routine check of the AXIS scintigraphic camera in the Nuclear Medicine Department in Pribram. In my Thesis I focused on the analysis of the recommended procedures and choice of the method, which during the routine operation of nuclear medicine will sufficiently prove the quality of the preparation of the apparatus for the examination and is not very time-consuming. The result of such an optimization analysis is the check procedure of the internal image homogeneity, which fully respects SÚJB recommendations and procedures recommended by the producer of the AXIS scintigraphic camera. Performance of the chosen method is described in detail and the method of the recording, acquisition and evaluation of the acquired data is presented. Checking of the AXIS apparatus in the described way has been performed in the Nuclear Medicine Department in Pribram for a long time. It enabled me to make an analysis of the long-term stability of the apparatus for the last 5 years. Acquired results have been compared with information given by the producer and results of the similar device in the Czech Republic. For clarity purposes the presentation of the recorded data and acquired results is arranged in tables and graphs. Collected data confirmed that the homogeneity values measured by means of the point source correspond well to the data stated for this apparatus by the producer. This has also confirmed my hypothesis on the correct choice of the method for testing the homogeneity by means of the point source. Therefore it is possible to state that the AXIS gamma camera with the supplement for the detection of positron emitters is stable and it is possible to apply it in the routine clinical operation even after 10 years of use provided that the good service care is ensured.
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DST-XL scintillation camera and stability of its visual field uniformity
 RUDOLFOVÁ, Veronika
Visual field uniformity of DST-XL scintillation camera is assessed on daily basis during quality controls of instrumentation at the Department of Nuclear Medicine at Hospital in České Budějovice. Uniformity is a critical quality parameter in scintigraphic imaging. It indicates whether all points in visual field are displayed with equal efficiency (sensitivity). Also, it allows specialists to obtain quality images of how radiopharmaceuticals are distributed in a patient?s body. The objective of my bachelor?s thesis is to verify whether the measured values fall within the range set by the manufacturer. Assessments were carried out on a bi-weekly basis for the duration of six months between start of October 2010 and end of March 2011. The measurement method used at the Department of Nuclear Medicine at Hospital in České Budějovice employs homogeneous irradiation of the detector without collimator produced by a point source which allows assessment of intrinsic uniformity of the detector. Also, there is another method that determines total (extrinsic) uniformity of the camera. This method utilizes an area source to produce homogeneous irradiation of the detector. The important difference between the two methods is that the latter uses collimator, unlike the method used for the purposes of this thesis. Yet, both methods produce roughly the same outcomes. The results obtained from the tests of stability of DST-XL scintillation camera?s visual field uniformity fall within the range of values permitted by the manufacturer and confirm my hypothesis.
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