PACS: Picture Archiving and Communication System. Feipei Lai National Taiwan University. PACS. A comprehensive computer system that is responsible for the electronic storage and distribution of medical images in the medical enterprise. Reduce costs Improve patient care. PACS 網路架構圖.
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1. Core Switch 6509 擺放位置
2.Main PACS client 連接方式
Client 端透過 Edge Switch 連接到 Core Switch上，每台 Edge Switch再分別透過光纖連結到不同的 Core Switch上做線路備援
3.舊有 RAD PACS 設備連接方式與線路更新
西址影醫部相關網點均加以重新佈線，東址影醫部所新增之網點亦加以重新佈設，並於東址影醫部新增所需之機櫃放相關之設備。所有 RAD PACS的設備均將連接至新的 PACS Core Switch上，並針對相關的流量設定一個獨立的網段，讓不相干的人無法存取影醫部的 PACS資料。
東址影醫部高階設備為 30台，西址影醫部為 3台。連接方式為東址影醫新增一台48埠10/100/1000之交換器，西址影醫部新增一台24埠10/100/1000之交換器。然後再將設備利用光纖連接到 Core Switch上
5. 公館分院與總院間 RAD PACS存取方式
a.利用設備本身的控制功能，設定ACL之機制，限制相關的存取權限，讓只有影醫部的 IP才可存取 RAD PACS的資料。
The phenomenon of spins aligning themselves to an external magnetic field.
At 0 K all spins are aligned when an external magnetic field is present (a);
when no external magnetic field is present the spins will point in all directions (b);
at room temperature only a small part of the nuclei will align themselves: 1 per million (c)
at a field strength of 0.1 tesla
and 5 per million (d) at a magnetic field strength of 0.5 tesla
Precession of magnetization under the influence of an external magnetic field
with strength Bo and an oscillating field B1
(due to electromagnetic radiation) during a 90 RF pulse as seen from the observer (A)
and as seen from the standpoint of the rotating field (B) (Philips).
B = B0 z
ω0 = γB
γ= gμB / h,
Principle of computed tomography. of angular momentum that may be considered, but using the following formula we may find the factor of interest.
The combination of X-ray tube and detector is translated across the patient,
producing a density profile p(k, f).
By rotating the X-ray tube-detector combination,
a number of profiles will be obtained.
From these profiles the attenuation coefficients of each pixel can be determined.
The intensity of the transmitted beam as a function of the attenuation coefficient
of the pixels traversed.
Upper part, the intensity after crossing one volume element;
middle part, after traversing n volume elements; lower part, the analog case.
Example of cross-sections through several parts of the body: but the length of the paths traversed through each pixel has changed. In this way we obtain new equations with the same number of unknowns. By measuring the intensity profiles at enough angles we can, in principle, obtain as many equations as there are unknowns.
skull, thorax, and abdomen, obtained by computed tomography.
Attenuation coefficients of several tissues expressed in Hounsfield units.
Figure 2. Extraction of the hepatic parenchyma (parts a and b), the vascular trees and hepatic lesions (parts c and d) from a CT scan image.
Figure 2. Endoscopic view of painted information after an antegrade flythrough (left); and an example of a missed patch after both antegrade and retrograde flythroughs (right). The green areas were visualized, while the reddish areas were missed.
Figure 1. The essential data needed (boundaries and tag lines) from each MRI-SPAMM short-axis image: (left) End-diastole short-axis view; (right) Mid-contraction short-axis view.
Figure 2. Foot anatomy: a) flexor muscles (oblique view), b) all the structures (oblique view), c) a "reference" 3D model (plantar view), d) corresponding medical illustration based on the model in c).