| Medical Radioisotope Dose Calibrator, a very important dosage measurementequipment in the field of nuclear medicine, plays a very important role in the fields ofradioactive diagnosis, radioactive treatment and nuclear medicine. However, there is agreat gap between the development and production of Radioisotope Dose Calibrator in ourcountry and that in other countries, which is a great disadvantage to the rapid developmentof nuclear medecine in our country. In order to promote the development of nuclearmedecine in our country, we have studied and bettered the existing Radioisotope DoseCalibrator, which is practically maningful to the progress of modern nuclear medecine, inthe present research, we applied the virtual instrument technology LabVIEW to the designof Radioisotope Dose Calibrator and illustrated the advantages of the virtual RadioisotopeDose Calibrator system developed by LabVIEW in the field of data acquisition, dataanalysis and data processing.The present thesis begins with the background of the selected object, illustrating themeaning, the main content of the topic and the present research condition of the topic bothat home and abroad. In chapter 2, we introduced Radioisotope Dose Calibrator fromdifferent aspects, such as the basis definition, the measuring priciple, the model installmentcomposition, the special microelectric current pre-amplifier, the electric circuit gaincontent. And we pointed out the related factors that affect the technology index, such as thebackground responds, relatively basic technical specification duplication, linearity andstability and so on. In chaper 3, we introduced in datails the definition, the composition,the development platform and the main disadvantages of virtual instrument. In chapter 4,we put forward the general design plan and manifested the software design and hardwaredesign through the block diagram. In Chapter 5, aiming at characteristics of the ionizationchamber output signal, we designed the voltage amplification electric circuit, the voltagefrequency switching circuit. We imput the TTL signal to computer through the USB-6009data acquisition card of NI and showed the actuation method of USB-6009, the connection way of the exterior interface, and the process in which we design the task by DAQ. InChapter 6, we achieved the functional design of virtual Radioisotope Dose Calibrator byapplying the LabVIEW programming technology. Great emphasis was put on theintroduction to the programming design and the realization process of the virtualmeasurement system, that is, the numerical program design, which measures the frequencysignal, and other program designs such as the signal treatment, clear zero, demostrationand memory. Chapter 7 demostrated the achievement progress of the software andhardware system, that is, the actual electric circuit design of the voltage-frequencytransformation and the final achievement and controlling method of the software system.Chapter 8 demostrated the hardware elctric circiut of the system and the softwaredubugging result and error analysis.In the concluding part, we gave a brief summary to our study and a wonderful prospectof our study. |
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