By Ami E. Iskandrian
Nuclear cardiac imaging refers to cardiac radiological diagnostic strategies played as a result of radiopharmaceuticals, that are perfused into the myocardium as markers. those imaging stories offer a variety of information regarding the center, together with the contractility of the guts, the quantity of blood provide to the center and no matter if elements of the guts muscle are alive or lifeless. This is key info for cardiologists, and nuclear imaging has turn into an more and more vital a part of the cardiologist's armamentarium.
Iskandrian's textual content has develop into a number one e-book within the box and the fourth variation will proceed the culture. The textual content is thoroughly up-to-date to mirror the various advances within the box, and, as a brand new function, each one bankruptcy concludes with a Q&A consultation on vital and tough medical matters.
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Extra resources for Nuclear Cardiac Imaging: Principles and Applications
An ion source is at the center of an evacuated chamber that contains two hollow conductive shells, called dees, separated by a gap across which an electric ﬁeld is applied. The chamber is between the poles of a high–ﬁeld strength magnet. The charged particle acquires an incremental increase in kinetic energy when accelerated by the electric ﬁeld between the two dees. On entering one of these hollow conductive dees, the particle no longer experiences the effects of the electric ﬁeld but is affected by the magnetic ﬁeld, which causes it to move in a circular path.
This is referred to as the f-factor or the roentgen-to-rad conversion factor. 16 The exposure rate (X/t) from a point source of gamma rays varies inversely as the square of the distance (d). It is the product of the activity (A) and the exposure rate constant (Γ) divided by the distance squared. 17 Example of Exposure Rate and Attenuation Calculations What is the exposure rate at 20 cm from a 30 mCi point source of Tc99m in air? What would it be if the source was shielded by 1/16" of lead? 8 mR/hr An alternative method to calculate the dose rate to a small mass of a material at a distance from a radioactive source is to measure the exposure rate and then convert to absorbed dose, again using the appropriate mass energy absorption coefﬁcients.
5 cm thick NaI(Tl) detector for which the intrinsic efﬁciency for the 159 keV gammas from I-123 is 90%. If the I-123 source is measured at 25 cm from the detector, and a net count rate of 1000 cps is observed, what is the activity of the I-123 source? The 159 keV gamma rays are emitted in 83% of the disintegrations. 8 μCi that has taken up the radiopharmaceutical absorbed in the target organ or tissue. The target organ or tissue is that for which the dose is being calculated. 19. The equilibrium dose constant is the amount of energy emitted in the form of the ith type of radiation per disintegration.