Oconnor, mayo clinic, rochester, mn the purpose of quality control qc is to detect changes in the performance of a gamma camera system that may adversely affect the interpretation of clinical studies. In 1958, his epochmaking work was presented at the annual meeting of the society of nuclear medicine snm 10. A scintillation event in a gamma camera is described by the position where the gamma photon. The uniformity directly determines the quality of the recorded images.
Dec 20, 20 a prototype of this gamma camera, referred to as the scintillation camera and later the anger camera, was constructed successfully and used for imaging of human organs in vivo. Understand the physics and selection criteria of scintillation detectors. The effect of object size on the sensitivity of single photon. Basic principles of gamma camera imaging and quality control. Imaging and detectors for medical physics lecture 5. Design from the exterior to interior a camera is comprised o. Hal oscar anger may 20, 1920 october 31, 2005 was an american electrical engineer and biophysicist at donner laboratory, university of california, berkeley, known for his invention of the gamma camera in all, anger held 15 patents, many of them for work at the ernest o. The anger scintillation gammacamera design has been utilized since 1957. The gamma camera records the quantity and distribution of the radionuclide that is attracted to a specific. This implies higher photons energies in nuclear medicine and thicker detectors. The first scintillation camera or gamma camera proposed by hal anger 1957 consisted of a singlepinhole collimator, a 4indiameter by 14inthick naitl crystal, seven 1. In this chapter, we discuss briefly some general aspects of radionuclide imaging, and we describe the basic principles of the most widely used imaging device, the gamma camera, also known as the anger scintillation camera, named after its inventor, hal anger see chapter 1, section c and fig. Iterative reconstruction of the detector response for.
Computer to build up the image from many detection events operation. Required equipment, phantoms and sources for intrinsic uniformity. Hal anger 1958 developed a visualisation device with 10cm diameter circular naitl crystal, pinhole collimator, and 7 pmts. The applications of scintigraphy include early drug development and nuclear medical imaging to view and analyse images of the human body or the distribution of. Acceptance testing for nuclear medicine instrumentation. The second type of radiation detector we will discuss is called the scintillation detector. The practice of nuclear medicine achieved a milestone with the invention in 1956 by hal anger of the scintillation camera.
This is known as compton scattering and some such scattered photons are thus lost to the anger camera because of the deflections caused. The anger scintillation camera uses radioactivity and scintillations flashes of uv light emitted when a highenergy photon hits a particle to determine the spread of a radioisotope throughout a persons body. However,aparallelchannel collimatorcanbedesignedto giveasgoodresolutionasdesiredatanydepth. Rectilinear scanner rectilinear scanner was developed by benedict cassen1950s a single moving radiation detector sampled the photon fluence at a small region of the image plane at a time the detector was scanned mechanically in a rasterlike pattern over the area of interest. He took an interest in the field of electrical engineering, and he received a bachelor of science degree in 1943 from the university of california. Sum of all outputs measures total light energy of incoming photon. Multiplexed readout electronics for imaging spectroscopy of highenergy xray and gamma photons. The basic design of a largearea naitl scintillation crystal, read out by an array of photomultiplier tubes pmts, in combination with an absorptive collimator has been so in.
Apr 14, 2006 the anger camera also known as the gamma camera or scintillation camera was invented by hal o. This type of collimatorcamera arrangement is called an anger camera after its inventor. Recently two directconversion cadmiumzinctelluride czt detector cameras have become available. Anger in 1957 and it is still the primary imaging instrument used in nuclear medicine. Introduction and rationale the uniformity of the gamma camera is a measure of local variation in sensitivity of the detector surface. Iterative reconstruction of the detector response for medical. Position patient as close to collimator face as possible reference. He was working one evening in his laboratory in wurzburg, germany with a device which fired a beam of electrons at a target inside an evacuated glass tube. The continuous sodium iodide scintillator crystal coupled to an array of photomultiplier tubes, almost universally referred to as the anger camera after its. Scintillation camera, scintillation gamma camera, gamma scintillation camera or anger gamma camera a gamma camera is an imaging device used in nuclear medicine to scan patients who have been injected, inhaled, or ingested with small amounts of radioactive materials emitting gamma rays. If we had a radioactive source and a scintillator in the lab we could darken the room, move the. The gamma camera records the quantity and distribution of.
A gamma camera, also called a scintillation camera or anger camera, is a device used to image gamma radiation emitting radioisotopes, a technique known as scintigraphy. If the uniformity is not correct, small abnormalities can be missed or artefacts. Discuss the relative merits of different imaging systems and how these have driven clinical acceptance. Ants has been successfully applied for optimization of the microstripbased gaseous secondary scintillation detector with an array of pmts for thermal neutron imaging 5 21. The anger camera also known as the gamma camera or scintillation camera was invented by hal o. This type of collimator camera arrangement is called an anger camera after its inventor. Jan 07, 1986 in a scintillation camera with a position calculation circuit which is indispensable to the anger scintillation camera, the number of incident gamma rays is integrated only in the lengthwise direction of the shielding plates of a rotatable parallel plate collimator. The anger scintillation camera becomes of age william g. Basic principles of scintillation detectors and gamma camera article pdf available in serbian journal of experimental and clinical research 112. In june of that year, he conducted a demonstration of the camera at the snm.
Recent advances in nuclear medicine imaging technology. The author named this device scintillation camera, although it is now usually referred as an anger camera. Understand the critical design issues in the development of gamma and pet cameras. Dec 31, 2014 the anger scintillation gamma camera design has been utilized since 1957. Only in the past few years has anyone designed a gamma camera that differs significantly from angers original design. The gamma rays emitted by the radiopharmaceutical in the body can be scattered by electrons within molecules in the body. The anger scintillation gammacamera design has been utilized since 1957 5. The anger scintillation gamma camera design has been utilized since 1957 5. In spect system, we get a scintillation camera mounted around the patients body and it is connected to a proper computer system. Gamma cameras also called scintillation cameras or anger cameras are the predominant nuclear medicine imaging machine currently in use.
Pdf basic principles of scintillation detectors and. Dec 01, 2005 only in the past few years has anyone designed a gamma camera that differs significantly from angers original design. It consists of a large diameter naitl scintillation crystal which is viewed by a large number of photomultiplier tubes. A later version of the basic anger camera is shown in figure 21. These materials are variously called fluorescent materials, fluors, scintillators or phosphors. The anger camera principle has shown a practical limit of a few millimeters spatial resolution. It measures the distribution of scintillation photons incident. Gamma rays are emitted in a persons body via a chemical tracer to determine where the radioactive. Feb 26, 2016 in this chapter, we discuss briefly some general aspects of radionuclide imaging, and we describe the basic principles of the most widely used imaging device, the gamma camera, also known as the anger scintillation camera, named after its inventor, hal anger see chapter 1, section c and fig. Anger also developed a multiplane tomographic radiation scanner using the anger camera and a focussed radiation collimator. Ants 21 22, capable to perform fast simulations of anger camera type scintillation detectors.
With this, activity could be processed in real time making dynamic blood flow studies possible and greatly reducing imaging times for static studies. Although many other ideas for nuclearimaging instruments have come along since then, none, with the exception of modern positron emission tomography systems see chapter 18, has matched the gamma. The effect of object size on the sensitivity of single. Highresolution emccd scintillation gamma cameras tu delft.
Quality control of scintillation cameras planar and spect. Gamma camera developed by hal anger at berkeley in 1957 therefore also called anger camera an electronic device that detects gamma rays emitted by radio pharmaceautical e. Acceptance testing of an angertype scintillation camera by the user. Physical inspection to check the total system for shipping damage e. Computer aided scintillation camera acceptance testing, 1981 tg 22. Rotating scintillation camera spect acceptance testing and quality control, 1987. Myers the ohio state university, columbus, ohio j nucl med 20. The essential physics of medical imaging, jt bushberg, ja seibert, em leidholdt jr, jm boone, 3rd. Although there have been many improvements in this device resulting from better components, advanced electronics, and digital implementations, the fundamental. Original research open access the effect of object size on. After developing gamma camera we get multiple gamma camera which generate a three dimensional image.
Use of a gammaray pinhole camera for in vivo studies. Anger 1, a number of papers describing both the physical. The scintillation detector was possibly the first radiation detector discovered. Slides to iaea nuclear medicine physics handbook iaea human. In a scintillation camera with a position calculation circuit which is indispensable to the anger scintillation camera, the number of incident gamma rays is integrated only in the lengthwise direction of the shielding plates of a rotatable parallel plate collimator. Planar gamma camera planar gamma camera uniformity 1. Single photon emission computed tomography spect and positron emission tomography pet obeys this technology. This report was prepared by the nuclear medicine committee of the. Gamma camera components and operation gamma camera components. In a medical gamma camera with a naitl scintillation crystal, the number of photon produced by a 140 kev gamma ray is smaller by approximately two orders of magnitude, leading to potentially much larger statistical fluctuations in the pmt signals. Imaging devices anger type gamma cameras, 2005 iec 616752. Pdf basic principles of scintillation detectors and gamma. Anger scintillation gamma camera authorstream presentation. You might have heard the story of the discovery of xrays by wilhelm roentgen in 1895.
It consists of a lead shield with a pinhole aperture, a scintillating crystal within the shield viewed by a bank of seven photomultiplier tubes, a signal matrix circuit, a pulse. Original research open access the effect of object size. Explain the technology of various gamma and pet camera innovations that. Review of how a gamma scintillation camera works cameras artifacts collimators 15. Gamma cameras are traditionally regarded as large bulky devices mainly because the design emphasis has been on the production of large area imaging systems for whole body scanning. Single photon computed tomographsspect, 2005 aapm task group reports tg 9. The author named this device scintillation camera, although it is. A quality control system and method are provided for troubleshooting and performance testing of detectors in a gamma camera that includes a field programmable gate array for forming digital words to be converted to a pulse, a test pattern generator for storing the digital words, a digital analog converter for converting the digital words into an analog voltage, an amplifier for amplifying and. To overcome this limit, a new gamma camera prototype has been developed, based on a position. The performance of a scintillation gamma detector depends on the scintillator used, the type of photo. Us7394072b2 gamma camera calibration and diagnosis using. Basic physics of nuclear medicinescintillation detectors.
Scintillations are minute flashes of light which are produced by certain materials when they absorb radiation. He was born in denver, colorado, on may 24, 1920, and grew up in long beach, california. Physics in nuclear medicine university of michigan. Scintillation camera definition of scintillation camera. Anger received several awards in recognition of his inventions and their contributions. Quality control of scintillation cameras planar and spect michael k. Iterative reconstruction of the detector response for medical gamma cameras. This instrument, the anger scintillation camera, 1 or gamma camera, has been sub stantially refined and improved. Scintillations that fall in a certain range of brightness, such as. In 1957, he invented the scintillation camera, known also as the gamma camera or anger camera.