Books on the topic 'Gamma camera'

Nuclear cardiology imaging is traditionally performed on an Anger gamma camera. Its key component is a large, flat, circular or rectangular sodium iodide crystal, activated by non-radioactive thallium (NaI(Tl)). The side of the crystal facing the patient is covered with a lead collimator, while the side away from the patient is viewed by an array of photomultiplier tubes (PMTs). This chapter provides detail on the gamma camera, including information on crystals and collimators, PMTs, and electronics. Important measures of gamma camera performance parameters and quality control are covered in detail, and a section on dedicated solid-state cardiac gamma cameras is included.

Crystals and collimators 32Photomultiplier tubes and electronics 34Gamma camera performance parameters and quality control (1) 36Gamma camera performance parameters and quality control (2) 38Nuclear cardiology imaging is performed on an Anger gamma camera. Its key component is a large flat circular or rectangular sodium iodide crystal, activated by non-radioactive thallium (NaI(Tl)). The side of the crystal facing the patient is covered with a lead collimator, whilst the side away from the patient is viewed by an array of photomultiplier tubes (PMTs)....

Readable, practical, and concise, the Oxford Specialist Handbook in Nuclear Cardiology is a self-contained guide to this cardiac imaging subspecialty. Including both technical and clinical aspects, it provides a foundation of essential knowledge common to practitioners from any background.This title covers radiation physics, biology and protection, and addresses all areas of imaging including the design and operation of the gamma camera (including solid-state cameras), single photon emission computed tomography (SPECT) acquisition and processing, and image interpretation and writing of reports. Stress testing and radiopharmaceuticals are explained in detail, as is the evidence base underpinning myocardial perfusion scintigraphy. Newer radionuclide imaging techniques are well covered (e.g. phosphate scintigraphy in cardiac amyloidosis), as is the expanding field of cardiac positron emission tomography (PET). Fully updated with coverage of new indications for gamma camera imaging, increased focus on attenuation correction and SPECT-CT, and detail on the design use and clinical implications of solid-state gamma cameras throughout, this second edition of the essential text for nuclear cardiology trainees and practitioners is fully illustrated with colour plates to aid clinical practice. Presented in the bestselling Oxford Handbook format, Nuclear Cardiology provides core knowledge for those training in the subspecialty, whether at a basic or advanced level or from a medical or technical background, and is a key resource for those seeking to accredit in the subspecialty.

Protocols for SPECT MPI have evolved over the last 40-years based on the following factors: available radiotracers and gamma camera imaging systems, alternative methods of stress, the needs and demands of patients and referring physicians, the need for radiation dose reduction and optimization of laboratory efficiency. Initially studies were performed using dynamic exercise planar multi-day Thallium-201 (Tl-201) studies. Pharmacologic stress agents were not available and novel methods of stress included swallowed esophageal pacing leads, cold presser limb emersion, direct atrial pacing, crushed dipyridamole tablets and even the use of intravenous ergonovine maleate. Eventually intravenous dobutamine, dipyridamole, adenosine and regadenoson became available to allow reliable and safe pharmacologic stress for patients unable to exercise. Tomographic SPECT camera systems replaced planar units and Tc-99m agents offered better imaging characteristics over Tl-201. These gamma camera systems, radiopharmaceutical agents and pharmacologic stress agents were all available by the mid-1990s and still represent the majority of MPI being performed today.

The application of nuclear medicine techniques in the diagnosis and management of rheumatological conditions relies on its ability to detect physiological and pathological changes in vivo, usually at an earlier stage compared to structural changes visualized on conventional imaging. These techniques are based on the in-vivo administration of a gamma-emitting radionuclide whose distribution can be monitored externally using a gamma camera. To guide a radionuclide to the area of interest, it is usually bound to a chemical label to form a 'radiopharmaceutical'. There are hundreds of radiopharmaceuticals in clinical use with different 'homing' mechanisms, such as 99 mTc HDP for bone scan and 99 mTc MAA for lung scan. Comparing pre- and posttherapy scans can aid in monitoring response to treatment. More recently, positron emission tomography combined with simultaneous computed tomography (PET/CT) has been introduced into clinical practice. This technique provides superb spatial resolution and anatomical localization compared to gamma-camera imaging. The most widely used PET radiopharmaceutical, flurodeoxyglucose (18F-FDG), is a fluorinated glucose analogue, which can detect hypermetabolism and has therefore been used in imaging and monitoring response to treatment of a variety of cancers as well as inflammatory conditions such as vasculitis, myopathy, and arthritides. Other PET radiopharmaceuticals targeting inflammation and activated macrophages are becoming available and could open new frontiers in PET imaging in rheumatology. Nuclear medicine procedures can also be used therapeutically. Beta-emitting radiopharmaceuticals, such as yttrium-90, invoke localized tissue damage at the site of injection and can be used in the treatment of synovitis.

Os textos produzidos na denominada América Portuguesa (1500-1822) abrangem os mais variados campos das letras ocidentais – lírica, épica, dramaturgia, historiografia, epistolografia, parenética, lexicografia, etc. – e seguem um modelo retórico-poético e teológico-político comum, próprio das Letras do Ancien Régime. Manuscritos e impressos escritos em várias línguas (português, principalmente, mas também em latim, castelhano, francês, italiano, tupi-guarani, língua geral, etc.), por um número de autores considerável (Pero Vaz de Caminha, José de Anchieta, Antônio Vieira, Francisco Manuel de Melo, Gregório de Matos, Manoel Botelho de Oliveira, Sebastião da Rocha Pita, Basílio da Gama, Antônio da Costa Peixoto, Francisco Alves de Sousa, etc.), corriam com avidez entre os leitores. São justamente esses textos, esses autores e esses leitores os que conformam o sistema cultural das Letras na América Portuguesa. A historiografia brasileira, portuguesa e inclusive internacional tem se debruçado há já vários decênios no estudo dos Estados do Brasil e do Maranhão e Grão-Pará, tanto de um ponto de vista micro-histórico como macro-histórico, salientando-se nos últimos tempos a sua relação com o resto do mundo, no âmbito próprio da global history. Nos últimos decênios, ao mesmo tempo, a literatura vem perdendo, paulatinamente, o seu poder de conhecimento legitimador das elites culturais de uma nação. Esse esquecido «Parnaso Brasileiro» mantinha, no entanto, um fluido diálogo cultural com Lisboa assim como com outras cidades europeias, diálogo esse que os processos de formação das literaturas exclusivamente nacionais, brasileira e/ou portuguesa, vieram apagar ou até mesmo ignorar. No espaço hermenêutico próprio dos Atlantic Studies, recuperam-se, neste livro, as Letras escritas e lidas na América Portuguesa, estudam-se seus autores, interpretam-se textos escolhidos e indaga-se tanto sobre seus primeiros leitores, como sobre seus leitores de ontem e de hoje. Um conjunto de docentes do Brasil, de Portugal, da Alemanha e da Espanha discute textos de Vaz de Caminha, Ambrósio Fernandes Brandão, Antônio Vieira, Botelho de Oliveira, Basílio da Gama, Antônio da Costa Peixoto e Santa Rita Durão, entre outros. Die in der sogenannten »América Portuguesa« (1500-1822) entstandenen Texte gehören zu verschiedensten Diskursformen der westlichen Literatur und Kultur: Lyrik, Epik, Dramaturgie, Historiographie, Epistolographie, Homiletik, Lexikographie usw. Sie folgen einem gemeinsamen rhetorisch-poetischen und theologisch-politischen Modell, das charakteristisch für die Texte des Ancien Régime war. Manuskripte und Drucke in verschiedenen Sprachen (hauptsächlich Portugiesisch, aber auch Latein, Spanisch, Französisch, Italienisch, Tupi-Guarani, Língua Geral etc.) von einer beachtlichen Anzahl von Autoren (Pero Vaz de Caminha, José de Anchieta, Antônio Vieira, Francisco Manuel de Melo, Gregório de Matos, Manoel Botelho de Oliveira, Sebastião da Rocha Pita, Basílio da Gama, Antônio da Costa Peixoto, Francisco Alves de Sousa usw.) fanden eine umfassende Leserschaft. All diese Elemente - Texte, Autoren und Leserschaft – bilden das System der »Letras« in der »América Portuguesa«. Die brasilianische, portugiesische und sogar die internationale Geschichtsschreibung konzentriert sich seit mehreren Jahrzehnten auf das Studium der Kolonialstaaten Brasil und Maranhão e Grão-Pará sowohl aus mikro- als auch aus makrohistorischer Sicht. Gleichzeitig verliert die Literatur in den letzten Jahrzehnten allmählich die Funktion, das Wissen der kulturellen Eliten einer Nation zu legitimieren. Der aktuell wenig beachtete »Parnaso Brasileiro« unterhielt einen intensiven kulturellen Dialog mit Lissabon wie auch mit anderen europäischen Städten, einen Dialog, der der Ausbildung ausschließlich nationaler Literaturen, brasilianischer und/oder portugiesischer, wenig Stellenwert einräumte oder sie sogar ignorierte. Im hermeneutischen Raum, den die Atlantic Studies eröffnen, erschließt dieses Buch die in der »América Portuguesa« geschriebenen und gelesenen Texte, beschäftigt sich mit ihren Autoren, interpretiert ausgewählte Texte und fragt nach ihren ersten Lesern sowie nach ihren Leserinnen und Lesern gestern und heute. Eine Gruppe von Wissenschaftlerinnen und Wissenschaftlern aus Brasilien, Portugal, Deutschland und Spanien diskutiert Texte u.a. von Vaz de Caminha, Ambrósio Fernandes Brandão, Antônio Vieira, Botelho de Oliveira, Basílio da Gama, Antônio da Costa Peixoto und Santa Rita Durão. The texts produced in the so-called “América Portuguesa” (1500-1822) cover the most varied fields of Western Literature and Culture – lyric, epic, dramaturgy, historiography, epistolography, homiletics, lexicography, etc. – and follow a common rhetorical-poetic and theological-political model, typical for the Ancien Régime. Manuscripts and prints were written in various languages (Portuguese, mainly, but also Latin, Spanish, French, Italian, Tupi-Guarani, Língua Geral, etc.), by a considerable number of authors (Pero Vaz de Caminha, José de Anchieta, Antônio Vieira, Francisco Manuel de Melo, Gregório de Matos, Manoel Botelho de Oliveira, Sebastião da Rocha Pita, Basílio da Gama, Antônio da Costa Peixoto, Francisco Alves de Sousa, etc.) found a broad reception by readers. Precisely, these texts, these authors and these readers constituted the literary system in the “América Portuguesa”. Brazilian, Portuguese, and even international historiography has focused for several decades on the study of the colonial states Brasil and Maranhão e Grão-Pará, both from a micro-historical and macro-historical point of view, emphasizing recently their relationship with the rest of the world in the context of global history. Currently, literature is gradually losing its power of legitimising knowledge of the cultural elites of a nation. This forgotten “Parnaso Brasileiro” maintained, however, a fluid cultural dialogue with Lisbon as well as with other European cities, a dialogue that the formation of exclusively national literatures, Brazilian and/or Portuguese, came to neglect or even ignore. In the hermeneutic space opened up by the Atlantic Studies, this book deals with texts written and read in the “América Portuguesa”, studies its authors, interprets selected works and inquires both about its first readers and about its readers yesterday and today. A group of scholars from Brazil, Portugal, Germany and Spain discusses texts by Vaz de Caminha, Ambrósio Fernandes Brandão, Antônio Vieira, Botelho de Oliveira, Basílio da Gama, Antônio da Costa Peixoto and Santa Rita Durão, among others.

Con base en una exhaustiva revisión de archivos en Alemania, Inglaterra, Estados Unidos y México y con una perspectiva que va de lo internacional a lo local, La Llegada al Sur presenta una nueva y fresca lectura que cambia nuestra visión de uno de los aspectos clave para la modernización del México porfiriano: el manejo de las tierras baldías. Al reconstruir la concesión para el deslinde de los terrenos baldíos en el estado de Chiapas (1881-1917), el libro recupera una historia que distingue claramente lo sucedido en Chiapas de lo ocurrido en el centro o norte del país y rompe con las frecuentes generalizaciones historiográficas. En un estilo casi policiaco, el autor sigue los pasos de una serie de actores que lo llevan de un olvidado paraje montañoso en Sonora, pasando por Baja California, a los despachos de presidentes, secretarios y tycoons de la economía internacional, para aterrizar en un análisis innovador de su actuación en el estado de Chiapas. Con una amplia gama de documentos públicos y privados, el texto reconstruye la estrecha red de intereses políticos y económicos manejada desde Palacio Nacional que movía el redituable negocio de las tierras baldías del país. De esta manera se visualiza cómo su operación en Chiapas estaba conectada íntimamente con la seguridad nacional, el trazo y la defensa de las fronteras nacionales, la defensa de las tierras comunales, igual que con la constante lucha de las oligarquías nacionales y locales por el poder.