Stereoscopic DSA of the central nervous system

Takahashi, M; Bussaka, H.; Miyawaki, Masayuki

doi:10.1007/bf00327880

Cited by 11 publications

(3 citation statements)

References 6 publications

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“…In this experiment, the effect of reminiscence of the different components of the system was avoided by the fact that a low acquisition rate was used (1 s elapsed between right and left image). Previous studies [1,12,14] have shown that an efficient stereo effect for angiograms is obtained with usual image rate (two images per second) at which reminiscence of the different components of the system may be neglected.…”

Section: Discussionmentioning

confidence: 99%

“…Several studies have pointed out the great advantage of this technique in clinical condition, as vascular neighboring of a lesion can be three dimensionally assessed and vessels overlapping discriminated [7][8][9][10][11][12][13][14][15]. It has also been demonstrated that detail visibility is improved from the fact that the signal-to-noise ratio is increased by a factor √ 2 by a twin exposure of the same object [10][11][12][13][14][15][16][17]. Despite these advantages, stereoscopic X-ray technique is still experimental, probably because of practical considerations.…”

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confidence: 99%

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Depth separation in ten observers with a new stereoscopic X-ray acquisition system

et al. 1997

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The aim of this work was to assess the depth separation of a new X-ray digital stereo angiographic system through visualization on a stereoscopic monitor. Before starting the clinical trial of this new stereo-digital angiographic system, it seemed to us mandatory to assess the inherent performance of the system to depict depth information, as well as the ability of the users to work with it. With this idea we designed a global test based on the observation of a physical test object by the potential users of the system, during a session long enough to simulate an angiographic study. The acquisition system consisted of a twin focal-spot X-ray tube and a standard DSA DG 300 (General Electric/CGR). The stereo display was controlled by a liquid crystal modulator placed in front of a black-and-white monitor. Special polarized glasses worn by the observers allowed right- and left-image separation. Depth separation was measured in ten observers by means of a stereoscopic test object. Six of the ten observers were able to locate accurately three-dimensional patterns separated by a 12- to 1.5-mm gap. No learning effect was noticed. This result suggested that stereo display through wireless polarized glasses coupled to up-to-date digital subtraction angiography technology may provide an accurate and ergonomic way to a dimensional enhancement of X-ray angiography.

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Section: Discussionmentioning

confidence: 99%

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confidence: 99%

Depth separation in ten observers with a new stereoscopic X-ray acquisition system

et al. 1997

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“…stereophotogrammetry to study the motion of orthopedic implants [2]. The use of x-ray stereoscopy in medicine is not limited to orthopedics but it is also used in several other fields such as angiography [3,4], neurology [5], radiotherapy [6], and mammography [7].…”

Section: Introductionmentioning

confidence: 99%

Measurement of micro-motions within non-transparent objects using gray scale information in x-ray stereo projection imaging

Salih

Buytaert²,

Dirckx³

2011

Meas. Sci. Technol.

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We propose a new technique to measure the 3D motion of marker points along a straight path within an object using x-ray stereo projections. From recordings of two x-ray projections at different angles, the 3D coordinates of marker points can be determined. By synchronizing the x-ray exposure time to the motion event, a moving marker leaves a trace in the image of which the gray scale is linearly proportional to the marker velocity. By measuring the marker gray scale along the motion path, the velocity at each point is determined and the position as a function of time is obtained by integration. In combination with the 3D information from two stereo recordings, the full 3D motion is obtained. The difference in position between the new method and laser vibrometry was less than 5 µm. The 3D motion measurement is performed within seconds, making the method ideal for applications in biomechanics. In combination with a full CT-scan of the object, the motion information on the marker points can be used to measure and visualize how an internal rigid 3D structure moves. We demonstrate the method on the malleus ossicle motion in the gerbil middle ear as a function of pressure on the eardrum.

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