JP2013070893A5 - - Google Patents
Download PDFInfo
- Publication number
- JP2013070893A5 JP2013070893A5 JP2011213685A JP2011213685A JP2013070893A5 JP 2013070893 A5 JP2013070893 A5 JP 2013070893A5 JP 2011213685 A JP2011213685 A JP 2011213685A JP 2011213685 A JP2011213685 A JP 2011213685A JP 2013070893 A5 JP2013070893 A5 JP 2013070893A5
- Authority
- JP
- Japan
- Prior art keywords
- ray
- image
- transmitted
- image processing
- irradiated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Description
操作ユニット120は、入力装置121と、画像処理装置122と、表示装置125と、記憶装置123と、システム制御装置124とを備えている。入力装置121は、被検体氏名、検査日時、撮影条件等を入力するための装置であり、具体的にはキーボードやポインティングデバイス等である。画像処理装置122は、データ収集装置107から送出される計測データを演算処理してCT画像の再構成を行う装置である。表示装置125は、画像処理装置122で作成されたCT画像を表示する装置であり、具体的にはCRT(Cathode-Ray Tube)や液晶ディスプレイ等である。
Operation unit 120 includes an input device 121, an image processing apparatus 122, a display unit 125, a storage device 123, and a system controller 124. The input device 121 is a device for inputting a subject's name, examination date and time, imaging conditions, and the like, specifically a keyboard, a pointing device, and the like. The image processing apparatus 122 is an apparatus that reconstructs a CT image by performing arithmetic processing on measurement data transmitted from the data collection apparatus 107. The display device 125 is a device that displays the CT image created by the image processing device 122, and is specifically a CRT (Cathode-Ray Tube), a liquid crystal display, or the like.
記憶装置123は、データ収集装置107で収集したデータ及び画像処理装置122で作成されたCT画像の画像データ等を記憶する装置であり、具体的にはHDD(Hard Disk Drive)等である。システム制御装置124は、これらの装置及びガントリ制御装置108と寝台制御装置109とX線制御装置110を制御する装置である。
The storage device 123 is a device that stores data collected by the data collection device 107, image data of a CT image created by the image processing device 122, and the like, specifically, an HDD (Hard Disk Drive) or the like . System controller 124 is a device for controlling these devices and gantry controller 108 and the bed control unit 109 and the X-ray controller 110.
X線管装置101から照射されるX線は、コリメータ103の一部であるX線補償フィルタ103aを透過する。X線補償フィルタ103aは図3に示すような中央部が最も薄く周辺に向かうにしたがい厚くなる形状を有している。このような形状のX線補償フィルタ103aを透過したX線の強度分布は、中央ch付近が最も大きく、周辺chに向かうにしたがい減少するような山型の強度分布となる。
X-rays irradiated from the X-ray tube device 101 pass through an X-ray compensation filter 103a that is a part of the collimator 103 . The X-ray compensation filter 103a has a shape as shown in FIG. 3 where the central portion is the thinnest and becomes thicker toward the periphery. The intensity distribution of the X-ray transmitted through the X-ray compensation filter 103a having such a shape is a mountain-shaped intensity distribution that is the largest in the vicinity of the center ch and decreases as it goes to the peripheral ch.
次に、オーバーフローが発生した場合について図5、6を用いて説明する。図5は、図3と同様な透過X線分布の計測結果の例であるが、図3の場合よりも照射されるX線量が大きく、回転角度θが90degのときに透過X線量の計測データが測定上限値305に達し、オーバーフローが発生したことを示している。なお、図5では回転角度θが0degのときにはオーバーフローは発生していない
照射されるX線量が大きすぎる場合以外にも、X線検出器106の後段に接続されるアンプに設定されたゲインが高すぎる場合にオーバーフローが生じる。例えば、X線減弱率の大きい腹部や骨盤部の画質を重視してアンプのゲインを高く設定した状態で全身撮影をした場合、頸部や脚部では回転中心付近に空気が存在するだけでありX線を減弱させる物体がないため、オーバーフローが生じることとなる。
Next, the case where an overflow occurs will be described with reference to FIGS. FIG. 5 is an example of the measurement result of the transmitted X-ray distribution similar to that in FIG. 3, but the measurement data of the transmitted X-ray dose when the irradiated X-ray amount is larger than that in FIG. Indicates that the measurement upper limit value 305 has been reached and overflow has occurred. In FIG. 5, no overflow occurs when the rotation angle θ is 0 deg . In addition to the case where the irradiated X-ray dose is too large, the gain set for the amplifier connected to the subsequent stage of the X-ray detector 106 is high. If too much overflows. For example, when taking a whole body image with the gain of the amplifier set high with an emphasis on the image quality of the abdomen and pelvis with a high X-ray attenuation rate, there is only air near the center of rotation in the neck and legs. Since there is no object that attenuates X-rays, overflow occurs.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2011213685A JP5971911B2 (en) | 2011-09-29 | 2011-09-29 | X-ray CT system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2011213685A JP5971911B2 (en) | 2011-09-29 | 2011-09-29 | X-ray CT system |
Publications (3)
Publication Number | Publication Date |
---|---|
JP2013070893A JP2013070893A (en) | 2013-04-22 |
JP2013070893A5 true JP2013070893A5 (en) | 2014-10-16 |
JP5971911B2 JP5971911B2 (en) | 2016-08-17 |
Family
ID=48475872
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2011213685A Active JP5971911B2 (en) | 2011-09-29 | 2011-09-29 | X-ray CT system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP5971911B2 (en) |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001257592A (en) * | 2000-03-09 | 2001-09-21 | Mitsubishi Electric Corp | Measuring device |
JP4033649B2 (en) * | 2001-08-15 | 2008-01-16 | 株式会社日立メディコ | X-ray inspection equipment |
US7149276B2 (en) * | 2004-07-14 | 2006-12-12 | Kabushiki Kaisha Toshiba | System, method, and computer program product that corrects measured data |
US7382853B2 (en) * | 2004-11-24 | 2008-06-03 | General Electric Company | Method and system of CT data correction |
JP4769487B2 (en) * | 2005-05-20 | 2011-09-07 | 株式会社日立メディコ | X-ray measuring device |
JP4713952B2 (en) * | 2005-06-02 | 2011-06-29 | 株式会社東芝 | Automatic exposure control device for X-ray fluoroscopy |
JP4912990B2 (en) * | 2007-09-05 | 2012-04-11 | 浜松ホトニクス株式会社 | Solid-state imaging device |
JP2010127924A (en) * | 2008-12-01 | 2010-06-10 | Toshiba It & Control Systems Corp | Conical trajectory tomographic apparatus |
-
2011
- 2011-09-29 JP JP2011213685A patent/JP5971911B2/en active Active
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US9883845B2 (en) | Radiographic apparatus and tomographic apparatus | |
WO2014084291A1 (en) | X-ray ct device and tomographic imaging method therefor | |
US9872660B2 (en) | Medical diagnostic imaging system | |
CN103919608B (en) | Spacer from spiral reconstruction | |
JP6109650B2 (en) | X-ray diagnostic apparatus, exposure management apparatus, scattered radiation dose distribution forming method, and scattered radiation dose distribution forming program | |
JP5597650B2 (en) | Medical display system for displaying X-ray images | |
US9615808B2 (en) | Method and radiography system for grid-like contrast enhancement | |
Frush | Radiation, thoracic imaging, and children: radiation safety | |
JP2015527158A5 (en) | ||
JP2017051395A (en) | Radiation image processing device, method, and program | |
JP2014054425A5 (en) | ||
JP2014054425A (en) | X-ray diagnostic apparatus | |
JP6523653B2 (en) | Radiation irradiation apparatus and dose control system | |
US20170020478A1 (en) | X-ray ct apparatus and scanning method | |
US9839403B2 (en) | Medical imaging apparatus and method for processing medical image | |
WO2020059306A1 (en) | Image processing device, image processing method, and image processing program | |
US10070841B2 (en) | Arithmetic device, X-ray CT apparatus, and image reconstruction method | |
US20160354050A1 (en) | Radiography apparatus, radiography method, and radiography program | |
Li et al. | X-ray digital intra-oral tomosynthesis for quasi-three-dimensional imaging: system, reconstruction algorithm, and experiments | |
JP2013070893A5 (en) | ||
US10405822B2 (en) | X-ray CT apparatus | |
JP6744749B2 (en) | Radiation imaging apparatus, radiation imaging system, radiation imaging method, and program | |
JP2011047819A (en) | Nuclear medicine diagnostic equipment and image processing apparatus | |
WO2012102052A1 (en) | Radiological imaging device and method | |
US20230070561A1 (en) | Radioscopy apparatus, radioscopy method, radioscopy program, fluoroscopic image display device, fluoroscopic image display method, and fluoroscopic image display program |