Data/hora: 13/06/2024 17:41:19

Biblioteca(s): 	Embrapa Instrumentação.	
Data corrente: 	22/12/1999	
Data da última atualização: 	22/12/1999	
Autoria: 	CRUVINEL, P. E.; CRESTANA, S.	
Afiliação: 	EMBRAPA-CNPDIA.	
Título: 	The use of X and gamma rays dedicated computerized minitomography scanner in agriculture due to the limitations imposed by medical computerized tomography scanners.	
Ano de publicação: 	1997	
Fonte/Imprenta: 	In: WORKSHOP ON CYBERNETIC VISION, 2., Dec. 1996, Sao Carlos, SP. Proceedings... Los Alamitos: IEEE Computer Society, 1997.	
Páginas: 	p. 208-212.	
Idioma: 	Inglês	
Conteúdo: 	X-rays computerized tomography (CT) is becoming a popular method of obtaining cross-sectional images of objects. Many commercial CT scanners using continuous spectrum X-rays from either an X-ray tube or y-ray source are now available, mainly for medical use. Additionally to its use in medicine, today CT technique, for example, is being widely used for non-medical applications. The main limitations in using medical CT scanners in non-medical applications is not only the complexity and the high cost of the CTs but mainly due to its response in energy. Besides, the medical CT scanners are always very busy, and dedicated to be used for patients. In 1987 was developed at the Center for Instrumentation (CNPDIA) of the Brazilian Enterprise for Agricultural Research Center (EMBRAPA) and X- and g- rays computerized minitomography scanner for multidisciplinary use. Since 1987 several multidisciplinary works have been carried out from CNPDIA, mainly related to applications to soil physics. In the present study, the importance of the use of dedicated CT scanners and data processing is demonstrated for the evaluation of soil bulk density. Besides, for comparison, it is also outlined measurements using a third generation medical computerized tomography scanner. Results show the usefulness of the use of a dedicated CT scanner, mainly due to image contrast characteristics and cost.	
Palavras-Chave: 	Agricultural instrumentation; Congresses; Congressos; Gamma-ray; Instrumentacao agropecuaria; Medical tomography; Minitomografia; Minitomography; Tomografo medico; X-ray.	
Thesagro: 	Raio Gama; Raio X; Tomografia.	
Thesaurus Nal: 	tomography.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Instrumentação (CNPDIA)	
Exemplares: 	CNPDIA - (5659-1) - UPC - SP - -- - PROCI-97.00070 -  - 1997.00070 - DIS