標(biāo)題: Titlebook: MRI Physics for Radiologists; A Visual Approach Alfred L. Horowitz Book 19922nd edition Springer-Verlag New York, Inc. 1992 Magnetic Resona [打印本頁] 作者: odometer 時間: 2025-3-21 18:14
書目名稱MRI Physics for Radiologists影響因子(影響力)
書目名稱MRI Physics for Radiologists影響因子(影響力)學(xué)科排名
書目名稱MRI Physics for Radiologists網(wǎng)絡(luò)公開度
書目名稱MRI Physics for Radiologists網(wǎng)絡(luò)公開度學(xué)科排名
書目名稱MRI Physics for Radiologists被引頻次
書目名稱MRI Physics for Radiologists被引頻次學(xué)科排名
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書目名稱MRI Physics for Radiologists年度引用學(xué)科排名
書目名稱MRI Physics for Radiologists讀者反饋
書目名稱MRI Physics for Radiologists讀者反饋學(xué)科排名
作者: Indolent 時間: 2025-3-21 23:12
Radiofrequency Pulseurrent through a wire, we create an electromagnetic field. That is, we have both an electrical field and a magnetic field at the same time, which means that either a charged particle or a “magnetizable” substance would experience a force when placed in this region. Now if we make that current an . c作者: 跟隨 時間: 2025-3-22 01:26 作者: Anticlimax 時間: 2025-3-22 08:11
Gradientshow these different intensities are arranged in space to produce an image. There are a number of ways of doing this, but in this section, we will be concerned only with the most widely used method: two dimensional Fourier transform (“2DFT”) reconstruction.作者: rheumatism 時間: 2025-3-22 08:55
The Slice Select Gradientdient imposes a gradual change in the main magnetic field from the head to the foot end of the patient. If we graph the z gradient with the magnitude of the magnetic field on the y axis and the position along the long axis of the body on the x axis, then we obtain the straight line shown in the grap作者: PRO 時間: 2025-3-22 15:17
The Phase Encoding Gradiention just as we did for the x axis. However, if we did that, then we would not be able to uniquely specify whether a given frequency belonged to the x or the y axis, and the computer would get confused and render us an improper image reconstruction. So we must do something else, and in fact, all comm作者: MERIT 時間: 2025-3-22 19:00 作者: happiness 時間: 2025-3-23 00:49
Wrapping up Basic Conceptsrequency change; and the y gradient produces a phase change. It is important to realize that each gradient is the same physical phenomenon: a change in the magnetic field from one point in space to another. Also, each gradient produces the same basic effect on protons: the vector precession frequenc作者: avenge 時間: 2025-3-23 02:57 作者: persistence 時間: 2025-3-23 09:06
Motion devices used to control motion artifacts and MR angiography. Although we will try to explain every phenomenon in terms of the principles that we have already learned, this may not always be possible because of the complexity of this subject. However, we will be able to explain most things; and we w作者: 放逐某人 時間: 2025-3-23 10:38
Aliasingor “wrap-around”) is an important artifact that is relatively easy to understand. It is the phenomenon whereby an object that is outside the field of view becomes superimposed over the image, on the side opposite to where it is found. It usually occurs in the phase encoding axis, but can also occur 作者: Nonflammable 時間: 2025-3-23 15:07
uscum or chlamydia may be diagnosed in conjunctiva scrapings. Atopy may also result in papillary conjunctivitis and giant papillae may be seen in contact lens wearers. Granulomatous inflammation may occur with sarcoidosis, and fungal infection as well as foreign bodies. Cicatrising conjunctivitis ma作者: 裝勇敢地做 時間: 2025-3-23 19:28
uscum or chlamydia may be diagnosed in conjunctiva scrapings. Atopy may also result in papillary conjunctivitis and giant papillae may be seen in contact lens wearers. Granulomatous inflammation may occur with sarcoidosis, and fungal infection as well as foreign bodies. Cicatrising conjunctivitis ma作者: 流動性 時間: 2025-3-24 01:14 作者: pus840 時間: 2025-3-24 04:21
Alfred L. Horowitz M.D.ation, vascularisation, scarring and ulceration. Keratoplasty has transformed in recent years and although penetrating keratoplasty is still performed on a wide range of conditions techniques such as deep anterior lamellar keratoplasty for anterior pathology and Descemet’s membrane stripping with en作者: fabricate 時間: 2025-3-24 07:25
Alfred L. Horowitz M.D.uscum or chlamydia may be diagnosed in conjunctiva scrapings. Atopy may also result in papillary conjunctivitis and giant papillae may be seen in contact lens wearers. Granulomatous inflammation may occur with sarcoidosis, and fungal infection as well as foreign bodies. Cicatrising conjunctivitis ma作者: 恃強凌弱的人 時間: 2025-3-24 13:24 作者: 凌辱 時間: 2025-3-24 15:59
Alfred L. Horowitz M.D.uscum or chlamydia may be diagnosed in conjunctiva scrapings. Atopy may also result in papillary conjunctivitis and giant papillae may be seen in contact lens wearers. Granulomatous inflammation may occur with sarcoidosis, and fungal infection as well as foreign bodies. Cicatrising conjunctivitis ma作者: 勛章 時間: 2025-3-24 22:06 作者: narcissism 時間: 2025-3-25 01:52
ation, vascularisation, scarring and ulceration. Keratoplasty has transformed in recent years and although penetrating keratoplasty is still performed on a wide range of conditions techniques such as deep anterior lamellar keratoplasty for anterior pathology and Descemet’s membrane stripping with en作者: 你敢命令 時間: 2025-3-25 06:53 作者: Condescending 時間: 2025-3-25 08:38 作者: 邊緣 時間: 2025-3-25 13:06
Alfred L. Horowitz M.D.itted with a clinical history of “Retinal detachment – treatment unsuccessful.” Retinal detachment may be “Rhegmatogenous” which occurs when fluid passes from the vitreous cavity through a hole in the retina into the “subretinal space.” The “hole” or “tear” is most commonly secondary to degenerative作者: dainty 時間: 2025-3-25 18:57 作者: 女上癮 時間: 2025-3-25 23:24 作者: Jubilation 時間: 2025-3-26 00:50
Alfred L. Horowitz M.D.zoans, flatworms are metazoans, i.e. they have multicellular bodies. On an evolutionary scale of anatomical advancement their rather compact bodies, lacking a skeleton or blood system, are regarded as relatively primitive, although their three-layered (triploblastic) construction (ectoderm on the ou作者: Onerous 時間: 2025-3-26 08:13
Alfred L. Horowitz M.D.oxygen as air and biological and chemical processes may reduce this further. Warm water contains less oxygen than cool water and as the salt content of water increases the solubility of oxygen decreases. Reduced availability of oxygen is potentially limiting for active animals like fishes. Swimming 作者: Manifest 時間: 2025-3-26 10:27
f body undulations (Mann, 1962) in a similar way to the monogenean . (Chapter 3). However, this resemblance is superficial and leeches and monogeneans are unrelated and structurally very different. The body of a leech consists of a series of segments (metameres), each of which contains the same basi作者: 施魔法 時間: 2025-3-26 13:16
Alfred L. Horowitz M.D. life style for skin parasites. However, it is by no means clear what these advantages are. Ready access to host blood does not seem to have been a significant factor, since, with the exception of the polyopisthocotylean monogeneans, most monogenean gill parasites are epidermis feeders. Predation pr作者: Congregate 時間: 2025-3-26 17:10
Alfred L. Horowitz M.D.o Roberts & Janovy (2000), as many as 45,000 different kinds of protozoans have been identified to date and it is not surprising that contact between these organisms and fishes has produced a range of parasites with many different life styles. Some protozoans occur on the exposed surfaces (skin and 作者: CYN 時間: 2025-3-26 21:28 作者: 發(fā)微光 時間: 2025-3-27 04:34 作者: Observe 時間: 2025-3-27 05:36
The Slice Select Gradientdient imposes a gradual change in the main magnetic field from the head to the foot end of the patient. If we graph the z gradient with the magnitude of the magnetic field on the y axis and the position along the long axis of the body on the x axis, then we obtain the straight line shown in the graph in fig. 8.1 below.作者: 別名 時間: 2025-3-27 11:38 作者: Fraudulent 時間: 2025-3-27 15:10 作者: 一加就噴出 時間: 2025-3-27 18:26 作者: expdient 時間: 2025-3-28 00:36 作者: 遺傳學(xué) 時間: 2025-3-28 02:37 作者: single 時間: 2025-3-28 07:58 作者: 法官 時間: 2025-3-28 10:43
T2 and the Spin-Echo Pulse CycleIn preceding chapters, we glibly referred to the T2 decay of the Mx vector after application of the RF pulse. Actually, we oversimplified the case in order not to obscure the understanding of the relationship of T1 and T2 to TR and TE. But now, it is time to delve more deeply into what T2 actually is.作者: Cuisine 時間: 2025-3-28 16:22
Frequency GradientSo far, we have shown how we select an image plane, which represents only the first of the three coordinates that we must specify. To complete our image, we must understand how the other two orthogonal gradients specify the other two coordinates of each point in a given plane.作者: 殖民地 時間: 2025-3-28 20:46 作者: instulate 時間: 2025-3-28 23:40 作者: Oversee 時間: 2025-3-29 06:31
The Phase Encoding Gradientor the y axis, and the computer would get confused and render us an improper image reconstruction. So we must do something else, and in fact, all commercial scanners available today make use of “phase encoding”. This rather difficult concept will now be explained in depth.作者: 背帶 時間: 2025-3-29 08:19 作者: 疾馳 時間: 2025-3-29 13:42
Some other Pulse Cycles and Proceduresstanding of what they mean. And in fact, the author wishes to point out that at least one MR equipment vendor had for some time caused confusion by using the term “partial saturation” to refer to its T1 weighted single echo spin-echo. Fortunately, this has been rectified.作者: PRE 時間: 2025-3-29 19:34
Motion already learned, this may not always be possible because of the complexity of this subject. However, we will be able to explain most things; and we will be sure to acknowledge those instances where we fall short of an adequate explanation.作者: 思考才皺眉 時間: 2025-3-29 23:22
Book 19922nd editiond be understood without a sophisticated physics or mathematics back- ground. That is still my goal. However, in the interim, it has become clear to me that many magnetic resonance techniques that we now routinely use are inadequately understood by many of us. Therefore, I have re-structured and expa作者: 易受刺激 時間: 2025-3-30 00:54 作者: 極為憤怒 時間: 2025-3-30 06:08
Radiofrequency Pulseticle or a magnetizable substance would experience will vary in time from a maximum in one direction to a maximum in the opposite direction. It turns out that this variation in time can be mathematically described with a simple sine or cosine function.作者: Chronic 時間: 2025-3-30 09:22
Pulse Cycles, Pulse Sequences and Tissue Contrastof ourselves, for this is really the meat of part two of this book- the image in space. However, to understand how we get tissue contrast, we must be aware that the RF pulse must be repeated many times to produce an image.作者: 箴言 時間: 2025-3-30 15:58
Inside the “Black Box”: From Signal to Imageo light some of the more mysterious terms you may have encountered in your reading- such as “real and imaginary signals” or “k-space”, etc. And most important of all, we will examine the relationship of the 2DFT to the image.作者: 信徒 時間: 2025-3-30 20:14
tiva by pagetoid spread. Melanocytic lesions include naevi, primary acquired melanosis and malignant melanoma. Lymphomas are usually of mucosal associated lymphoid tissue type and are low grade. Some tumours are specific to the caruncle such as oncocytomas.作者: vibrant 時間: 2025-3-30 21:09 作者: 最初 時間: 2025-3-31 01:23
Alfred L. Horowitz M.D.must go through prior to producing a report and how these various techniques help to refine the diagnosis..?.The third edition of .Lee’s Ophthalmic Histopathology. is an invaluable reference source for ophthalmic pathologists, general pathologists and ophthalmologists..978-1-4471-7117-1978-1-4471-2476-4作者: 厭惡 時間: 2025-3-31 09:06 作者: Painstaking 時間: 2025-3-31 11:22 作者: Militia 時間: 2025-3-31 16:15
Alfred L. Horowitz M.D.and can affect the anterior cornea and Bowman’s layer, the stroma and the endothelium. A significant number of specimens will result from repeat keratoplasty and the potential findings in these specimens include inflammation in relation to the host graft junction and endothelium, a retrocorneal fibr
