標(biāo)題: Titlebook: Clinical MR Imaging and Physics; A Tutorial Haris S. Chrysikopoulos Book 2009 Springer-Verlag Berlin Heidelberg 2009 MR Angiography.MR Phys [打印本頁(yè)] 作者: Enlightening 時(shí)間: 2025-3-21 19:59
書目名稱Clinical MR Imaging and Physics影響因子(影響力)
書目名稱Clinical MR Imaging and Physics影響因子(影響力)學(xué)科排名
書目名稱Clinical MR Imaging and Physics網(wǎng)絡(luò)公開度
書目名稱Clinical MR Imaging and Physics網(wǎng)絡(luò)公開度學(xué)科排名
書目名稱Clinical MR Imaging and Physics被引頻次
書目名稱Clinical MR Imaging and Physics被引頻次學(xué)科排名
書目名稱Clinical MR Imaging and Physics年度引用
書目名稱Clinical MR Imaging and Physics年度引用學(xué)科排名
書目名稱Clinical MR Imaging and Physics讀者反饋
書目名稱Clinical MR Imaging and Physics讀者反饋學(xué)科排名
作者: accomplishment 時(shí)間: 2025-3-21 22:42
978-3-540-77999-5Springer-Verlag Berlin Heidelberg 2009作者: Coordinate 時(shí)間: 2025-3-22 03:10
Haris S. ChrysikopoulosClear, direct and succint description of the Physics of Magnetic Resonance.Description of the practical aspects of MR Imaging in a unique way, that has not been seen before.Includes supplementary mate作者: craving 時(shí)間: 2025-3-22 04:54 作者: 在駕駛 時(shí)間: 2025-3-22 10:44 作者: Cumulus 時(shí)間: 2025-3-22 15:47
Methodik in Theorie und Umsetzung,Magnetism and electricity are interrelated phenomena: a moving electrical charge creates a magnetic field. The reverse is also true: a magnetic field that varies in time induces the flow of electric current.作者: Cumulus 時(shí)間: 2025-3-22 19:21 作者: 放氣 時(shí)間: 2025-3-22 23:05
,Raumwirksamkeit ?konomischer Determinanten,The discussion in the preceding chapter is an approximation of the true state of affairs. We will now introduce the concept of rotation of the magnetization vectors.作者: Lasting 時(shí)間: 2025-3-23 04:38
Theorien, Modelle und Hypothesen,The stimulated spins want to return to the ground state; they can, upon liberation of the excess energy they carry. They only need to find an appropriate partner to accept the energy load. What we have now is a potential resonance pair: the excited spins are the energy source and their chemical surroundings (lattice) can serve as the receiver.作者: parallelism 時(shí)間: 2025-3-23 09:29 作者: Tdd526 時(shí)間: 2025-3-23 12:41
Resonance,Resonance is the coordinated coupling of energy (stimulus) to matter (system), resulting in the smooth, rhythmic motion of matter according to its inherent oscillation dynamics.作者: anticipate 時(shí)間: 2025-3-23 17:22
Electromagnetic Fields,Magnetism and electricity are interrelated phenomena: a moving electrical charge creates a magnetic field. The reverse is also true: a magnetic field that varies in time induces the flow of electric current.作者: animated 時(shí)間: 2025-3-23 19:47
Macroscopic Magnetization,Each tissue is composed of innumerable magnetization vectors (μ) that are distributed in all possible orientations in space; thus, the net macroscopic magnetization vector (M) is zero (Fig. 3a).作者: 徹底明白 時(shí)間: 2025-3-24 00:41
Macroscopic Magnetization Revisited,The discussion in the preceding chapter is an approximation of the true state of affairs. We will now introduce the concept of rotation of the magnetization vectors.作者: concentrate 時(shí)間: 2025-3-24 02:59 作者: 臭名昭著 時(shí)間: 2025-3-24 10:22
Magnetic Substrates of T2 Relaxation,In T2 relaxation there is a loss of phase coherence. Let us examine what conditions promote or resist dephasing.作者: 發(fā)誓放棄 時(shí)間: 2025-3-24 11:24
,Raumwirksamkeit ?konomischer Determinanten,ation), under the influence of the static field B. However, the magnetization vector M cannot be measured directly; thus, in order to investigate the patient we need to disturb the steady state and to observe the course of M as it returns to equilibrium.作者: 殘暴 時(shí)間: 2025-3-24 16:12 作者: 滲透 時(shí)間: 2025-3-24 22:48 作者: EWE 時(shí)間: 2025-3-25 00:27 作者: 不能妥協(xié) 時(shí)間: 2025-3-25 06:47 作者: sterilization 時(shí)間: 2025-3-25 08:49
R?umliche Mobilit?t und Lebenslauf(see Chap. 5). Since M. rotates in the xy plane, it is an oscillating magnetic field, and as such it induces the flow of electric current in a coil. Thus, through a coil or antenna the MR signal is transformed into an electric signal that describes a sinusoidal time course with rapid damping (Fig. 1作者: 試驗(yàn) 時(shí)間: 2025-3-25 13:37 作者: hauteur 時(shí)間: 2025-3-25 17:11
R?umliche Mobilit?t und Lebenslaufere on the T1 ascent. Thus, the final value of the signal is a mixture of spin density and both T1 and T2 relaxation mechanisms. The relative contribution (weight) of the above factors is modified by TR and TE, which determine the high and the low points that we reach on the T1 and T2 curves respect作者: 現(xiàn)任者 時(shí)間: 2025-3-25 23:49 作者: 正式通知 時(shí)間: 2025-3-26 03:46 作者: DECRY 時(shí)間: 2025-3-26 04:48
https://doi.org/10.1007/978-3-662-28279-3is linearly related to TR, one would be tempted to compress TR for time savings. This action (everything else held constant) poses two problems: low overall signal and poor tissue contrast, since we slide leftward on the T1 curve (Fig. 38). The ingenious solution is to disengage tissue saturation an作者: Arthropathy 時(shí)間: 2025-3-26 12:19 作者: agglomerate 時(shí)間: 2025-3-26 13:01
,Verarbeitung von Lokalisierungsausdrücken,nment (lattice). The 90° pulses (β) keep the entire bulk magnetization M on the xy plane, i.e., M. = 0. When the β pulse is withdrawn, the magnetization vector M begins its course toward equilibrium with gradual growth along the z-axis toward the value M. (Fig. 9).作者: Narcissist 時(shí)間: 2025-3-26 17:57
Ben Clark,Kiron Chatterjee,Glenn Lyonsissue variable that can influence the strength of the final MR signal, specifically the proton (or spin) density, i.e., the number of protons per unit of tissue. This number depends on the exact chemical make-up of each tissue and determines the maximum signal that each tissue can produce, represented by the plateau of the T1 curve (Fig. 9).作者: 飾帶 時(shí)間: 2025-3-26 23:36 作者: 暴露他抗議 時(shí)間: 2025-3-27 01:28 作者: 軟弱 時(shí)間: 2025-3-27 06:30 作者: 試驗(yàn) 時(shí)間: 2025-3-27 12:47
Excitation Phenomena,ation), under the influence of the static field B. However, the magnetization vector M cannot be measured directly; thus, in order to investigate the patient we need to disturb the steady state and to observe the course of M as it returns to equilibrium.作者: cancer 時(shí)間: 2025-3-27 13:38
T1 Relaxation (Longitudinal or Spin-Lattice Relaxation),nment (lattice). The 90° pulses (β) keep the entire bulk magnetization M on the xy plane, i.e., M. = 0. When the β pulse is withdrawn, the magnetization vector M begins its course toward equilibrium with gradual growth along the z-axis toward the value M. (Fig. 9).作者: Femine 時(shí)間: 2025-3-27 19:45 作者: bizarre 時(shí)間: 2025-3-28 00:26 作者: FLOAT 時(shí)間: 2025-3-28 05:33
Free Induction Decay,(see Chap. 5). Since M. rotates in the xy plane, it is an oscillating magnetic field, and as such it induces the flow of electric current in a coil. Thus, through a coil or antenna the MR signal is transformed into an electric signal that describes a sinusoidal time course with rapid damping (Fig. 19).作者: Conduit 時(shí)間: 2025-3-28 09:26 作者: 運(yùn)動(dòng)吧 時(shí)間: 2025-3-28 12:36
Book 2009 the MRI procedure. Te patient properties called spin, and can interact with electro- is placed in a magnetic feld and becomes temporarily 1 magnetic (EM) radiation through a process called magnetized. Resonance is achieved through the - resonance. When such nuclei absorb EM energy they plication of作者: coagulate 時(shí)間: 2025-3-28 17:41
https://doi.org/10.1007/978-3-658-43717-6gth of the static field B. So, if we force B to grow in a smooth and continuous manner along a line, then we spread the resonance frequencies, and each voxel along that line is tied to a unique frequency. Thus, the frequency of the received signal betrays the position of the voxel in question.作者: Accommodation 時(shí)間: 2025-3-28 21:26
,Image Formation – Fourier Transform – Gradients,gth of the static field B. So, if we force B to grow in a smooth and continuous manner along a line, then we spread the resonance frequencies, and each voxel along that line is tied to a unique frequency. Thus, the frequency of the received signal betrays the position of the voxel in question.作者: Pillory 時(shí)間: 2025-3-29 02:22
y, that has not been seen before.Includes supplementary mateKeywords Spin ? Electromagnetic radiation ? Resonance ? Nucleus ? Hydrogen ? Proton ? Certain atomic nuclei possess inherent magnetic Let us summarize the MRI procedure. Te patient properties called spin, and can interact with electro- is p作者: 卵石 時(shí)間: 2025-3-29 04:51 作者: impaction 時(shí)間: 2025-3-29 11:11
Heather Jones,Kiron Chatterjee,Selena Grayplished with an RF pulse of 180°, called the refocusing pulse. After the activation of such a pulse all spins are instantaneously shifted into mirror-image positions with respect to the z-axis (Fig. 20).作者: Bravura 時(shí)間: 2025-3-29 12:12
https://doi.org/10.1007/978-3-658-43717-6of the standard SE sequence. The new variable, called inversion time (TI), is the delay between the inversion and the excitation pulses. Thus, the familiar T1 curve is modified two-fold: it is “stretched” to twice the (vertical) distance as before, and it has to cross the zero (null) point (Fig. 26).作者: POWER 時(shí)間: 2025-3-29 16:38
https://doi.org/10.1007/978-3-662-28279-3verall signal and poor tissue contrast, since we slide leftward on the T1 curve (Fig. 38). The ingenious solution is to disengage tissue saturation and tissue contrast from the influence of TR, using excitation pulses (θ) less than 90° (partial flip angle).作者: 背景 時(shí)間: 2025-3-29 22:44
,T2 Relaxation (Transverse or Spin–Spin Relaxation), positive or negative deviations from the nominal strength of the main field B. Since the Larmor frequency follows the apparent value of B, there is a spread of the precession rates of the spins, around the nominal value. After a short time the microscopic spins (μ) move apart like a fan, and occupy random orientations (Fig. 11).作者: LEER 時(shí)間: 2025-3-30 01:32
Spin Echo,plished with an RF pulse of 180°, called the refocusing pulse. After the activation of such a pulse all spins are instantaneously shifted into mirror-image positions with respect to the z-axis (Fig. 20).作者: Capitulate 時(shí)間: 2025-3-30 04:20 作者: 哪有黃油 時(shí)間: 2025-3-30 09:10 作者: 侵略 時(shí)間: 2025-3-30 13:46 作者: 姑姑在炫耀 時(shí)間: 2025-3-30 18:43 作者: 空氣 時(shí)間: 2025-3-31 00:27
,T2 Relaxation (Transverse or Spin–Spin Relaxation),ex forces develop between dipoles moving in close proximity of each other, altering the local magnetic profiles. Thus, numerous sites develop slightly positive or negative deviations from the nominal strength of the main field B. Since the Larmor frequency follows the apparent value of B, there is a作者: Host142 時(shí)間: 2025-3-31 03:43 作者: 上坡 時(shí)間: 2025-3-31 06:01
Partial Saturation,ssue is given plenty of time to regain full strength of its longitudinal magnetization (M.). If TR < T1 (short TR), tissue M. stops very short of M., and is forced to a new steady state called partial saturation.作者: AVERT 時(shí)間: 2025-3-31 11:31
Free Induction Decay,(see Chap. 5). Since M. rotates in the xy plane, it is an oscillating magnetic field, and as such it induces the flow of electric current in a coil. Thus, through a coil or antenna the MR signal is transformed into an electric signal that describes a sinusoidal time course with rapid damping (Fig. 1作者: RUPT 時(shí)間: 2025-3-31 14:04 作者: EVEN 時(shí)間: 2025-3-31 17:52 作者: 別名 時(shí)間: 2025-4-1 01:11
Inversion Recovery,e and then collect the echo through a 180° pulse. This sequence is called inversion recovery (IR); it simply incorporates an inversion pulse in front of the standard SE sequence. The new variable, called inversion time (TI), is the delay between the inversion and the excitation pulses. Thus, the fam作者: Defiance 時(shí)間: 2025-4-1 03:38
,Image Formation – Fourier Transform – Gradients,n the FID curve, which comprises overt information about amplitude (intensity) and frequency and covert information about phase (Fig. 31). However, spatial knowledge is “l(fā)ost” since the signals from the individual voxels have merged into a composite FID wave. Somehow, we need to recover positional i作者: HAWK 時(shí)間: 2025-4-1 06:38 作者: 小樣他閑聊 時(shí)間: 2025-4-1 11:23 作者: 預(yù)定 時(shí)間: 2025-4-1 14:43 作者: Cryptic 時(shí)間: 2025-4-1 20:11
Der IT Security Manager978-3-658-09974-9Series ISSN 2522-0551 Series E-ISSN 2522-056X
