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Measurement of quality of gamma-cameras
Awadová, Thuraya ; Kolář, Radim (referee) ; Drastich, Aleš (advisor)
The topic of this bachelor thesis is the measurement of the gamma cameras’ quality. First, we will focus on the general methodology of imaging in gamma-imaging systems, on the particular types of constructions and technical parameters influencing the resulting imaging quality. In the practical part of the thesis we will pay attention to the methodology of measurement of particular technical parameters within planar or SPECT gamma cameras in a planar mode and their realisation at the Clinic of Nuclear Medicine, Faculty Hospital Brno. The measurement follows the recommendations of the State Office for Nuclear Safety and of the particular gamma camera producer. In conclusion, the stability of a particular quantitative parameter will be evaluated.
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Measurement of quality of gamma-cameras
Awadová, Thuraya ; Kolář, Radim (referee) ; Drastich, Aleš (advisor)
The topic of this bachelor thesis is the measurement of the gamma cameras’ quality. First, we will focus on the general methodology of imaging in gamma-imaging systems, on the particular types of constructions and technical parameters influencing the resulting imaging quality. In the practical part of the thesis we will pay attention to the methodology of measurement of particular technical parameters within planar or SPECT gamma cameras in a planar mode and their realisation at the Clinic of Nuclear Medicine, Faculty Hospital Brno. The measurement follows the recommendations of the State Office for Nuclear Safety and of the particular gamma camera producer. In conclusion, the stability of a particular quantitative parameter will be evaluated.
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Stability of the field of view uniformity in gamma kamera Infinia
KOLÁŘOVÁ, Hana
The methods of field-of-view uniformity measurement on Infinia scintillation cameras as applied within the daily quality control exercise are described, and the results are evaluated against the limiting levels specified by the manufacturer. Uniformity is a basic parameter describing the scintillation camera image quality. In order to assure a smooth and continuous operation of nuclear medicine departments, instrumentation must comply with quality requirements for the examination of patients. For Infinia scintillation cameras the manufacturer recommends their planar integral uniformity to be tested on a day-by-day basis. Infinia cameras are parts of SPECT/CT systems. If the planar parameters of the SPECT system are not very good, planar imaging is slightly affected but SPECT images in the tomographic mode can be ruined altogether.Two methods exist for uniformity measurement, using either a point source of ionizing radiation or a planar source of ionizing radiation, respectively. The main objective of this project was to collect measuring data from several departments, compare them and ascertain whether the data exceed the limit specified by the manufacturer. From the field-of-view uniformity measurements it can be concluded unambiguously that the limits specified by the manufacturer of the Infinia scintillation cameras were never exceeded. In other words, the performance of the detection technology was never so poor as to affect adversely the diagnostic information derived from the system. In conclusion, information gained within this work attests to the reliability of Infinia scintillation cameras.
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Thyroid radio-iodine uptake: Comparison of measured results by scintillation counter and scintillation gamma camera on patients with hyperthyrosis
DOSCHKO, Pavel
ABSTRACT The Bachelor{\crq}s Paper deals with the question of measurement of radioiodine accumulation in thyroid gland using scintillation probe and gamma camera by comparison of both the measurement methods. In the course of last fifty years, the 131I was thought to be safe and effective remedy in case of thyroid gland disorders, among which there are for instance hyperthyroidism or differentiated struma maligna. The method experienced its boom after the WW2 when 131I began to be produced in large quantities. The method of treatment is easy. The patient is administered a high dose (activity) of radioactive iodine, which is absorbed by thyroid. In case of patients suffering from hyperthyroidism the function of thyroid is subsequently reduced. After completion of the treatment, such patients are dependent on hormone replacement therapy using thyroid hormones. In case of patients suffering from struma maligna, the first solution is its surgical removal and after union of the scar, similar treatment is applied to remove small residues. The activity administered is even higher. The purpose is to destroy all pieces of thyroid gland tissue and metastases of differentiated struma maligna. At the present time, the level of accumulation of radioiodine in thyroid gland is measured and calculated on the basis of values of impulses acquired by means of scintillation probe, which is regarded as a standard procedure. The goal of the paper is to find out whether it is possible to obtain more accurate values of accumulation using the existing gamma cameras for scanning impulses above the area of thyroid gland. Another goal is to use the obtained values for the purpose of calculation of iodine accumulation. If measurement realized by means of the camera appears to be more accurate, I intended to propose its use as a new standard. I realized the respective measurements using scintillation probe and gamma camera. Measurement using probe is carried out in the prone position with the head bent back and the probe is at a distance of 25 centimetres from the patient{\crq}s neck. The value of impulses is measured twice, 1 minute per either measurement. While using camera, the detector is at a distance of approximately 10 centimetres from the patient{\crq}s neck and the period of measurement is approximately 15 minutes {--} only one measurement is realized. The individual accumulations are calculated on the basis of the values obtained. The result of the comparison was that the measurement using gamma camera was not much more accurate and the measurement by means of scintillation probe is faster and easier for the radiological assistant and for the patients as well.
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Influence of collimator type to scintillation camera parameters
ŠTĚDROVÁ, Veronika
Bachelor work Influence of collimator type to scintillation camera is focused especially on experimental measurement and elaboration of results. In theoretical section I deal with a base principle of scintigraphy, describing of Gamma camera, single types of collimators, splitting of collimators according to a type of construction, and according to spatial resolution and sensitivity. In other sections there are examined exact methodology of measurements sensitivity of collimator and spatial resolution and results of measurements. The results are compared with specification given by producers and values published by other authors. In conclusion I recommend the essential type of collimator for nuclear medicine department.
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