From: Subject: Date: Thu, 6 Dec 2001 18:19:37 -0600 MIME-Version: 1.0 Content-Type: multipart/related; boundary="----=_NextPart_000_000D_01C17E82.90665B80"; type="text/html" X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 This is a multi-part message in MIME format. ------=_NextPart_000_000D_01C17E82.90665B80 Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Content-Location: mhtml:file://E:\xiangwei\ui_research\zAnalyze\Analyze_render.mht

Description of a

"vessel render" procedure using=20 "Analyze"

By Xiangwei Zhang, Raj ( Nov. 5,=20 2001)

Part A: Load in data, Save data

Using =91Load as=92: "load as" can be used to load a = group of image=20 data. Some parameters viz. dimensions of images can be set while = loading. The user can set "width", "height", "depth" to specify = the=20 dimensions of the new data to be created. If these parameters = are larger=20 than the original ones, interpolation will be done (The user can = set the=20 interpolation method viz. "linear", "cubic", etc). If the = desirable=20 parameters, "width", "height", "depth" are smaller than the = original=20 parameters, sampling will be done. After you load in the data = (with the=20 parameters set as required), the user may save them for future = use.=20

Using =91Load=92: "Load" can be used when no parameter = change is=20 wanted, namely, the original date is loaded in without any = modification.=20

Part B: Registration

For registering the given vessel sequence, = there are=20 three methods viz. =91surface matching=92, =91voxel-by-voxel = matching=92 and=20 =91Match lab=92 (descriptions about these can be found in Analyze = Help).=20

Part C: = Preprocessing

Only low pass filter was tried, such as = "average=20 smoothing" and "median filter". This will result in the smoothing = of the=20 data, but the effect is not very = good.

Part D: = Volume render of=20 Registered data

Render type: There are several render types which user = can=20 specify. All the types support gray scale images, comparatively = fewer=20 types are available for color images. For gray scale images, = "gradient=20 shading", "surface projection" may give good results; but for = color=20 images, only "surface projection" gives fairly acceptable = results.=20

Threshold: Threshold is used such that the specific data = of=20 interest is used in the rendering procedure. Only data with = value=20 between "min" and "max" thresholds will be considered. Many = Different=20 combinations can be tried to get good results depending upon the = image=20 properties. In our case, "max" is in the range of 250-254 (254 = is a good=20 choice), and "min" is in the range of 30-100 (70 is a good = choice).=20

Specular Reflection. Factor: The larger the value of = factor, the=20 brighter and more discontinuities occur in the surface. A = moderate value=20 will result in a good view of the vessel. Different values were = tried,=20 the value =910.5=92 ( from 0.25 to 0.75, more generally) results = in good=20 rendering.. Exponent: The larger the exponent is, the = darker the=20 vessel looks, on the other hand, the smaller the exponent, the = brighter=20 the view. A value "10" is a good choice.=20

Light: The user can set the direction of the light = source . This=20 results in different views of the same vessel. There are some = options=20 viz. "horizontal" indicates the light source in the = horizontal=20 line, with "-90" from left and "90" from right; = "vertical"=20 indicates the light source in the vertical line, with "-90" from = bottom=20 and "90" from the top.=20

Fuzzy: This parameter affects the smoothness of the = rendered=20 vessel. The larger the "Distance", the smoother the = vessel looks.=20 "Range" also can affect the smoothness of the vessel.=20

Clip: The user can use this parameter to set which part = of the=20 vessel must be used in the rendering ( and consequently = displayed!).=20

Change view: This parameter can also be used to get the = cross=20 section in different orientations of the vessel, so that the = user can=20 visualize the real shape of the vessel in a specific position.=20

The end of the = page.

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