Comparison of geometric distortion in digital angiography with and without a correction program

2000 ◽  
Vol 93 (supplement_3) ◽  
pp. 223-227 ◽  
Author(s):  
Zhen Zheng ◽  
Douglas Shearer ◽  
Georg Norén ◽  
Prakash Chougule ◽  
Gerhard Friehs
Keyword(s):  
Standard Deviation ◽  
Computer Program ◽  
Digital Images ◽  
Imaging System ◽  
Geometric Distortion ◽  
Average Difference ◽  
Content Type ◽  
X Ray ◽  
X Ray Imaging ◽  
Fine Print

✓ This study was conducted to evaluate the geometric distortion of angiographic images created from a commonly used digital x-ray imaging system and the performance of a commercially available distortion-correction computer program. A 12 × 12 × 12—cm wood phantom was constructed. Lead shots, 2 mm in diameter, were attached to the surfaces of the phantom. The phantom was then placed inside the angiographic localizer. Cut films (frontal and lateral analog films) of the phantom were obtained. The films were analyzed using GammaPlan target series 4.12. The same procedure was repeated with a digital x-ray imaging system equipped with a computer program to correct the geometric distortion. The distortion of the two sets of digital images was evaluated using the coordinates of the lead shots from the cut films as references. The coordinates of all lead shots obtained from digital images and corrected by the computer program coincided within 0.5 mm of those obtained from cut films. The average difference is 0.28 mm with a standard deviation of 0.01 mm. On the other hand, the coordinates obtained from digital images with and without correction can differ by as much as 3.4 mm. The average difference is 1.53 mm, with a standard deviation of 0.67 mm. The investigated computer program can reduce the geometric distortion of digital images from a commonly used x-ray imaging system to less than 0.5 mm. Therefore, they are suitable for the localization of arteriovenous malformations and other vascular targets in gamma knife radiosurgery.

A new magnetic resonance head coil and head immobilization device for gamma knife radiosurgery: an analysis of geometric distortion and signal/noise characteristics

2002 ◽  
Vol 97 ◽  
pp. 563-568 ◽  
Author(s):  
Paul Jursinic ◽  
Robert Prost ◽  
Christopher Schultz
Keyword(s):  
Magnetic Resonance ◽  
Gamma Knife Radiosurgery ◽  
Geometric Distortion ◽  
Gradient Field ◽  
Main Magnetic Field ◽  
Content Type ◽  
Signal Noise ◽  
Noise Characteristics ◽  
Head Coil ◽  
Fine Print

Object. The authors report on a new head coil into which the Leksell aluminum localization frame can be easily and securely mounted. Mechanically, the head coil interferes little with the patient. Methods. The head coil, which is for magnetic resonance (MR) imaging, is a 12-element quadrature transmitand-receive high-pass birdcage coil with a nominal operation frequency (63.86 MHz). The coil was built into a plastic housing. This new head coil minimizes patient motion and provides a 20% increase in signal/noise ratios compared with standard head coils. An MR image test phantom was mounted in the coil and this allowed quantification of image distortion due to inhomogeneities in the main magnetic field, nonlinearity in the gradient field, and paramagnetism of the aluminum headframe. There were no significant differences in geometric distortion between the new head coil and the standard coil. Conclusions. The new head coil has advantages for reducing patient movement artifacts and has a better signal/noise ratio with no reduction in geometric accuracy.

Evaluation of a photon counting X-ray imaging system

2002 ◽  
Author(s):  
M. Lundqvist ◽  
B. Cederstrom ◽  
V. Chmill ◽  
M. Danielsson ◽  
B. Hasegawa
Keyword(s):  
Imaging System ◽  
Photon Counting ◽  
X Ray ◽  
X Ray Imaging

Anterior sacral meningocele contiguous with a pelvic hamartoma

1984 ◽  
Vol 61 (1) ◽  
pp. 188-190 ◽  
Author(s):  
Eugene Leibowitz ◽  
William Barton ◽  
Parvis Sadighi ◽  
Jeffrey S. Ross
Keyword(s):  
Computerized Tomography ◽  
Content Type ◽  
Transabdominal Approach ◽  
X Ray ◽  
Anterior Sacral Meningocele ◽  
Fine Print

✓ A patient with an anterior sacral meningocele combined with a hamartoma was diagnosed with x-ray films, myelography, and computerized tomography. She was successfully operated on by a transabdominal approach.

Scattering Ray and Exposure Dose Reduction by Using Metal Sheet in X-ray Imaging System

2021 ◽  
Vol 58 (6) ◽  
pp. 89-96
Author(s):  
Ho-Il Lee ◽  
Seok-Hwan Bae ◽  
Yeun-Chul Ryu ◽  
Young-Joon Park ◽  
Yong-Gwon Kim
Keyword(s):  
Dose Reduction ◽  
Imaging System ◽  
Exposure Dose ◽  
Metal Sheet ◽  
X Ray ◽  
X Ray Imaging

scholarly journals Evaluation of Effect of Posterior Dynamic Stabilization IntraSPIN System on Sagittal Spinal Balance using EOS® X-Ray Imaging System

2017 ◽  
Vol 08 (04) ◽  
Author(s):  
Simona Bistazzoni ◽  
Michelangelo De Angelis ◽  
Manuela D ercole ◽  
Carmela Chiaramonte ◽  
Antonio Carotenuto ◽  
...  
Keyword(s):  
Imaging System ◽  
Dynamic Stabilization ◽  
Spinal Balance ◽  
X Ray ◽  
X Ray Imaging ◽  
Posterior Dynamic Stabilization ◽  
Sagittal Spinal Balance

Spatio-temporal measurement of beam properties in the PLS diagnostic beamline

1998 ◽  
Vol 5 (3) ◽  
pp. 642-644 ◽  
Author(s):  
J. Y. Huang ◽  
I. S. Ko
Keyword(s):  
Visible Light ◽  
Imaging System ◽  
Ccd Camera ◽  
Photon Beam ◽  
Transverse Beam ◽  
Beam Position ◽  
X Ray ◽  
X Ray Imaging ◽  
Visible Light Imaging ◽  
Temporal Measurement

A diagnostic beamline is being constructed in the PLS storage ring for measurement of electron- and photon-beam properties. It consists of two 1:1 imaging systems: a visible-light imaging system and a soft X-ray imaging system. In the visible-light imaging system, the transverse beam size and beam position are measured with various detectors: a CCD camera, two photodiode arrays and a photon-beam position monitor. Longitudinal bunch structure is also investigated with a fast photodiode detector and a picosecond streak camera. On the other hand, the soft X-ray imaging system is under construction to measure beam sizes with negligible diffraction-limited error. The X-ray image optics consist of a flat cooled mirror and two spherical focusing mirrors.

scholarly journals A dual-energy phase retrieval algorithm forinline phase sensitive x-ray imaging system

2021 ◽  
Author(s):  
Muhammad Ghani ◽  
Laurie Fajardo ◽  
Aimin Yan ◽  
Xizeng Wu ◽  
Hong Liu
Keyword(s):  
Phase Retrieval ◽  
Imaging System ◽  
Dual Energy ◽  
Retrieval Algorithm ◽  
X Ray ◽  
X Ray Imaging ◽  
Phase Sensitive ◽  
Phase Retrieval Algorithm

X-ray-translucent retractors in spine surgery

1986 ◽  
Vol 64 (3) ◽  
pp. 520-521 ◽  
Author(s):  
Peter Knöringer
Keyword(s):  
Spine Surgery ◽  
Vertebral Column ◽  
Operating Time ◽  
Surgical Instruments ◽  
X Rays ◽  
Content Type ◽  
X Ray ◽  
Image Intensification ◽  
Fine Print

✓ With surgery of the vertebral column under image intensification, surgical instruments and conventional metal retractors often obscure important x-ray landmarks. Surgery is more difficult, operating time is longer, and exposure to x-rays is increased. The author has developed x-ray-translucent retractors for ventral and dorsal operations. Although for reasons of strength these retractors have somewhat more bulk than equivalent metal retractors, they are sufficiently stable and are compatible with spacial requirements. They can be sterilized and reused.

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