Abstract:
BACKGROUND:By reducing the specificity associated with loss of information, the influence of attenuation of the breasts is very important in myocardial perfusion studies. However, although several studies have been conducted over the past years, little has been developed to determine accurately the influence of the characteristics of the breasts on the quality of myocardial scintigraphy, avoiding additional exposure to radiation. OBJECTIVE:The purpose of this study is to quantify the attenuation of photons by the breasts, in myocardial perfusion studies with (99m)Tc according to different sizes and compositions. METHODS:Each breast was assumed to be a cube composed of fibroglandular and adipose tissue. The data related to (99m)Tc photons were analyzed in a Monte Carlo model. We varied the thickness and composition of breasts and analyzed the interference in attenuation. The EGS 4 software was used in the simulations. RESULTS:Setting the thickness of a breast, the variation of its composition causes a maximum increase of 2.3% in the number of photons attenuated. By contrast, maintaining a fixed composition of breast tissue, the difference in photon attenuation was 45.0%, averaging 6.0% for each additional centimeter in the breast thickness. CONCLUSION:Monte Carlo simulation showed that the influence of the thickness of the breasts in the attenuation of photons in myocardial scintigraphy with (99m)Tc is much greater than the influence of their compositions.
journal_name
Arq Bras Cardioljournal_title
Arquivos brasileiros de cardiologiaauthors
Oliveira A,Meguerian BA,Mesquita CTdoi
10.1590/s0066-782x2010005000162subject
Has Abstractpub_date
2011-01-01 00:00:00pages
8-12issue
1eissn
0066-782Xissn
1678-4170pii
S0066-782X2010005000162journal_volume
96pub_type
杂志文章abstract::We describe a rare case of permanent pacemaker implantation in a pregnant woman with rheumatic mitral valve disease previously undergoing percutaneous balloon valvuloplasty. She presented symptomatic advanced atrioventricular block of non-reversible cause and manifest in the third trimester of gestation. ...
journal_title:Arquivos brasileiros de cardiologia
pub_type: 杂志文章
doi:10.1590/s0066-782x2009000500017
更新日期:2009-05-01 00:00:00
abstract:BACKGROUND:Regular physical activity (PA) induces desirable changes in plasma levels of high- and low-density lipoproteins (HDL and LDL, respectively) and triglycerides (TG), important risk factors for cardiometabolic diseases. However, doubts whether intensity and duration have equivalent benefits remain. OBJECTIVE:T...
journal_title:Arquivos brasileiros de cardiologia
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journal_title:Arquivos brasileiros de cardiologia
pub_type: 杂志文章
doi:10.1590/s0066-782x2011005000083
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abstract:BACKGROUND:Congenital heart defects (CHD), as the most common congenital anomaly, have been reported to be associated with chromosomal abnormalities. Currently, patients with CHD are routinely offered karyotyping and chromosomal microarray (CMA) testing, but the genotype-phenotype relationship has not yet been fully es...
journal_title:Arquivos brasileiros de cardiologia
pub_type: 杂志文章
doi:10.5935/abc.20180144
更新日期:2018-10-01 00:00:00
abstract::The challenges that the COVID-19 pandemic cretead to the healthcare system have made it necessary to adapt routines and services, with the objectives of controlling the spread of the virus and preserving health. Safe and correct management of patients in risks groups, such as elderly patients, patients with cardiovasc...
journal_title:Arquivos brasileiros de cardiologia
pub_type: 杂志文章
doi:10.36660/abc.20200405
更新日期:2020-09-01 00:00:00
abstract:BACKGROUND:Determining the cardiovascular risk factors is essential for the primary and secondary prevention of circulatory system diseases. OBJECTIVE:To obtain the prevalence of cardiovascular risk factors in a population of industry workers in Brazil. METHODS:Transversal cohort study, with a sociodemographic interv...
journal_title:Arquivos brasileiros de cardiologia
pub_type: 杂志文章
doi:10.1590/s0066-782x2009000100004
更新日期:2009-01-01 00:00:00
abstract::Sinus of Valsalva aneurysm is a rare cardiac disorder. It is more frequently a congenital, but it may also be an acquired condition. Takayasu's disease is an extremely rare cause of this disorder. Most cases of unruptured sinus of Valsalva aneurysm are asymptomatic. Compression of the left coronary artery is an unusua...
journal_title:Arquivos brasileiros de cardiologia
pub_type: 杂志文章
doi:10.1590/s0066-782x2009000600017
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abstract:BACKGROUND:Data on the management and prognosis of patients with ST-segment elevation myocardial infarction (STEMI) and multivessel disease are limited in Brazil, showing that the available revascularization strategies should be investigated. OBJECTIVE:To assess the outcomes of complete revascularization versus treatm...
journal_title:Arquivos brasileiros de cardiologia
pub_type: 杂志文章,多中心研究
doi:10.36660/abc.20180346
更新日期:2020-08-28 00:00:00
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journal_title:Arquivos brasileiros de cardiologia
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journal_title:Arquivos brasileiros de cardiologia
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更新日期:1993-03-01 00:00:00
abstract:OBJECTIVE:To assess the relation between P-wave and QT dispersions in elderly patients with heart failure. METHODS:Forty-seven elderly patients (75.6+/-6 years) with stable heart failure in NYHA functional classes II or III and with ejection fractions of 37+/-6% underwent body surface mapping to analyze P-wave and QT ...
journal_title:Arquivos brasileiros de cardiologia
pub_type: 杂志文章
doi:10.1590/s0066-782x2002001400007
更新日期:2002-11-01 00:00:00
abstract::Ebstein's anomaly, although the most common malformation of the tricuspid valve, is a rare disease. Its association with other syndromes and extracardiac anomalies is very rare and has been reported in only a few cases. A case of prenatal diagnosis of Ebstein's anomaly in a patient with Down's syndrome is reported. ...
journal_title:Arquivos brasileiros de cardiologia
pub_type: 杂志文章
doi:10.1590/s0066-782x2004000400011
更新日期:2004-04-01 00:00:00
abstract:BACKGROUND:Chronic heart failure (CHF) is a complex syndrome which comprises structural and functional alterations in the heart in maintaining the adequate blood demand to all tissues. Few investigations sought to evaluate oxidative DNA damage in CHF. OBJECTIVE:To quantify the DNA damage using the comet assay in left ...
journal_title:Arquivos brasileiros de cardiologia
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更新日期:2017-04-01 00:00:00
abstract:BACKGROUND:Chronic exercise and food restriction (FR) have directionally opposite changes in transcription of molecular structures of calcium handling and thyroid hormone (TH) status. OBJECTIVE:Evaluate the association of chronic exercise and FR on serum thyroid hormones and gene transcription of molecular structures ...
journal_title:Arquivos brasileiros de cardiologia
pub_type: 杂志文章
doi:10.1590/s0066-782x2011005000066
更新日期:2011-07-01 00:00:00
abstract::OBJECTIVE - To assess the incidence of fatal pulmonary embolism (FPE), the accuracy of clinical diagnosis, and the profile of patients who suffered an FPE in a tertiary University Hospital. METHODS - Analysis of the records of 3,890 autopsies performed at the Department of General Pathology from January 1980 to Decemb...
journal_title:Arquivos brasileiros de cardiologia
pub_type: 杂志文章
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journal_title:Arquivos brasileiros de cardiologia
pub_type: 杂志文章
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journal_title:Arquivos brasileiros de cardiologia
pub_type: 杂志文章
doi:10.1590/s0066-782x2008000100008
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journal_title:Arquivos brasileiros de cardiologia
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journal_title:Arquivos brasileiros de cardiologia
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更新日期:2017-09-01 00:00:00
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journal_title:Arquivos brasileiros de cardiologia
pub_type: 杂志文章
doi:10.1590/s0066-782x2008000500006
更新日期:2008-05-01 00:00:00
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journal_title:Arquivos brasileiros de cardiologia
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更新日期:2013-02-01 00:00:00
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journal_title:Arquivos brasileiros de cardiologia
pub_type: 杂志文章
doi:10.1590/s0066-782x2011005000115
更新日期:2012-01-01 00:00:00
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journal_title:Arquivos brasileiros de cardiologia
pub_type: 杂志文章
doi:
更新日期:1995-09-01 00:00:00
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journal_title:Arquivos brasileiros de cardiologia
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journal_title:Arquivos brasileiros de cardiologia
pub_type: 杂志文章
doi:10.1590/s0066-782x2009000200004
更新日期:2009-02-01 00:00:00
abstract:PURPOSE:To evaluate the results of percutaneous balloon valvuloplasty (PBV) for membranous subaortic stenosis (MSAS). METHODS:Seven patients with MSAS were submitted to PBV using the retrograde approach. Hemodynamic and angiographic studies were performed before and after the procedure. The balloon/annulus ratio varie...
journal_title:Arquivos brasileiros de cardiologia
pub_type: 临床试验,杂志文章
doi:
更新日期:1997-05-01 00:00:00
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journal_title:Arquivos brasileiros de cardiologia
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doi:
更新日期:2007-07-01 00:00:00