what is a moire pattern in refernce to radiology?
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Moiré patterns are often an undesired artifact of images produced by various digital imaging and computer graphics techniques, e.g. when scanning a halftone picture or ray tracing a checkered plane. This cause of moire is a special case of aliasing, due to undersampling a fine regular pattern.
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Answer D is correct.\n\nYou can verify with a magnifying lens.\n\nWhen a magnifying lens is used to view objects enlarged, the virtual image is formed at the back of the lens\n\nA and B are partially correct and C   is wrong. D is fully correct.
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Radiology is the medical specialty that utilizes and interprets imaging technologies to diagnose disease. Traditionally it was the branch of medical science dealing with the medical use of X-rays emitted by X-ray machines or other such radiation devices for the purpose of obtaining visual information as part of medical imaging. Radiologists now also use all other imaging technologies (such as ultrasound, computed tomography (CT) and magnetic resonance imaging) to diagnose or treat disease. Interventional radiology is the performance of (usually minimally invasive) medical procedures with the help of medical imaging.\n\nOutside of the medical field, radiology also encompasses the examination of the inner structure of objects using X-rays or other penetrating radiation.\n\nwhere...\n\nSonographers are medical professionals who operate ultrasonic imaging devices to produce diagnostic images and scans, videos, or 3D volumes of anatomy and diagnostic data. Sonography requires specialized education and skills to view, analyze and modify the scan to optimize the information in the image.\n\nIn the United States the most widely accepted sonographic education is provided by CAAHEP/JRC-DMS accredited programs. The profession is sub-divided in specialties such as cardiac, obstetrical, vascular, and general sonographers. General sonographers are registered in abdominal and/or obstetric and gynecologic sonography.\n\nCertifications in sonography after examinations administered by the American Registry for Diagnostic Medical Sonography are recognized and administered in some countries outside the US.\n\n\n\nSo I think A sonographer is a doctor as long as he participates in the diagnoses.
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x-ray diffraction gives you basically the fourier transform of the lattice structure - so to get the actual lattice, you can inverse transform the XRD pattern to get the real-space structure.\n\nif you already know something about the crystal structure and just want to measure the lattice spacing (is that what you mean by lattice parameter) you can orient the various crystal planes relative to the xray beam, and use bragg's scattering law to calculate the lattice spacing.  \n\nbragg's law is nL = 2d sin T    where n is the order of the diffraction peak (n=1 for the maximum peak), L is lambda the wavelength of the xray beam, d is the lattice spacing and T (theta) is the angle between the beam and the crystal plane you are studying.
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L=levorotary(left)\nD=dextrorotary(right)\nR=rectus(right)\nS=sinister(left)\n\nThe L and D refer to which way polarized light is rotated when passed through a solution, while R and S refer to absolute conformation at particular atoms.
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Holography takes an impression of an image from several angles that incide at the same time on a photographic transluscent piece of film.  when the film is iluminated from the right angles with coherent light (such as lasers), the interlacing rays of light create a tri dimensional image corresponding to the original model.  Holo means "complete" and graphos means "picture".  If you cut in half the film that contains an holographic picture, you don´t get half of the picture.  Instead, you get a smaller but complete image of the original.
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Spiral, lenticular, elliptical and irregular\n\nSee the link
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its a picture of an organ or bones.  We call it also x-ray cause it use X-ray. on that source you have a couple of picture.
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dilation because it changes the size of the figure ... figures remain similar\n\nrotation, reflection and translation maintain congruence because all they do is change the position and/or orientation
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It is used in inspecting for micro fractures in metal and usually welding. Most places with govt. contracts especially for airplanes and weaponry can't afford micro fractures in welds and such. Some form of xray is also used to help detect fractures.
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A hologram is a 3d image of an object.  If you look at one you may try to reach out and touch it but nothing is there.\n\nWe don't actually see objects, we see the light that is reflected from them.  If that light is bent somehow the image will change and the appearance of the object will be different than the case of no interference.  We try to extrapolate what was actually there based on the light that reaches our eyes (and the extrapolation is distorted if the light gets bent).\n\nIn short, the mirage is a real image, but it is not a real object.
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Il a une circonférence de 68 à 71 cm et un poids de 396 à 453g. \n\nCes caractéristiques et texture changent chaque année.
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The intensity in a rectangular difraccion pattern is given by: \nI(theta)= I(0) [Sin (beta)/beta]^2\n\nThe minima are located where sin(beta)=0\n\nSo thats why you have to put beta=n*Pi as the condition to find a minimun\n\nMaxima are located at tan(beta)=beta which is a non analytical ecuation but a solution can be found graphically or numerically\n\nMaxima are at theta= 1.4306*pi    2.4590pi  3.4707pi
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The detection of X-rays is based on various methods. The most commonly known method are a photographic plate, or cassette, and rare earth screens.\n\nThe X-ray photographic plate is frequently used in hospitals to produce images of the internal organs and bones of a patient. The part of the patient to be X-rayed is placed between the X-ray source and the photographic plate to produce what is a shadow of all the internal structure of that particular part of the body being X-rayed. The X-rays are blocked by dense tissues such as bone and pass through soft tissues. Where the X-rays strike the photographic plate it turns black when it is developed. So where the X-rays go through "soft" parts of the body like organs and skin the plate turns black. Contrast compounds containing barium or iodine can be injected in the artery of a particular organ. The contrast compounds strongly block the X-rays and hence the circulation of the organ can be more readily seen.\n\nAnother method of detecting X-rays is a fluorescent plate. In modern hospitals a special plastic sheet is used in place of the photographic plate. The plastic sheet is read by a scanning laser beam. The resultant image is then stored in a computer. The plastic sheet can be used over and over again.
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It's probably the water causing refraction of the scope.  You'll see that at higher magnifications.  I think it's the same principle as a snowflake.
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The radiologist is completing the workup.  Many people are called back for more images or U/S.  It does not mean you have cancer.  It just means they want to look at something closer.  This happens all the time and I wouldn't worry about it especially if it is on both sides.\n\nGood luck
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THe image formed by a plane mirror has \n\na) the same size\n\nb) is at the same distance from the mirror as the object\n\nC) position opposite to the object\n\nD) kind : if the object is real the image is virtual\n\nif the oject is virtual, the image is real