Physical and clinical evaluation of a 2,048 × 2,048-matrix image intensifier TV digital imaging system in bone radiography

Higashida, Yoshiharu; Baba, Yuji; Hatemura, Masahiro; Yoshida, Akira; Takada, Takao; Takahashi, Manabu

doi:10.1016/s1076-6332(96)80274-1

Cited by 5 publications

(1 citation statement)

References 12 publications

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“…The focal-spot MTF was calculated based on the assumption of a rectangular distribution of the 0.1 and 0.3 mm focal spot size. All of the total MTFs were derived from the object plane rather than the image plane to facilitate the comparison of the imaging performance for the magnification techniques according to the following equation: MTF total = MTF pre 9 MTF fs , where MTF total is the total MTF at the object plane, MTF pre is the presampled MTF at the object plane, and MTF fs is the focal-spot MTF at the object plane [4,10]. The physical property of radiographic noise was quantified by means of the WS [11][12][13][14].…”

Section: Physical Imaging Propertiesmentioning

confidence: 99%

Digital magnification mammography with matched incident exposure: physical imaging properties and detectability of simulated microcalcifications

Tanaka

Naka

Fukushima

et al. 2011

Radiol Phys Technol

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Our purpose was to evaluate the usefulness of digital magnification mammography with matched incident exposure by investigating the physical imaging properties and doing an observer performance test. A computed radiography system and a mammographic unit were used in this study. Contact and magnification radiographies of 1.2-1.8 in combination with focal spot sizes of 0.1 mm without grid and 0.3 mm with grid were performed. Physical imaging properties, namely, scatter fraction, total modulation transfer function (MTF) including the presampled MTF and the MTF of focal spot size, and Wiener spectrum (WS), were measured. Detail visibility was evaluated by use of free-response receiver operating characteristic analysis of the detectability of simulated microcalcifications. Scatter fractions decreased considerably as the magnification factor increased without grid technique. In the grid technique, scatter fractions for all magnification techniques were comparable. The total MTFs of magnification techniques with a focal spot size of 0.1 mm improved significantly compared with the conventional contact technique. However, the improvement of the total MTFs of magnification techniques with the combination of 0.3 mm focal spot size was small. The WSs degraded with an increase of the magnification factor compared with the contact technique due to the maintained exposure incident on the object. The observer performance test indicated that the 1.8 magnification technique with the 0.1 mm focal spot size provided higher detectability than did the contact technique. Digital magnification mammography under the same incident exposure conditions improved the detectability of microcalcifications.

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Section: Physical Imaging Propertiesmentioning

confidence: 99%

Digital magnification mammography with matched incident exposure: physical imaging properties and detectability of simulated microcalcifications

Tanaka

Naka

Fukushima

et al. 2011

Radiol Phys Technol

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Investigation of optimum anti-scatter grid selection for digital radiography: physical imaging properties and detectability of low-contrast signals

Tanaka

Naka

Saito

et al. 2012

Radiol Phys Technol

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Our aim in this study was to evaluate the effect of the grid variations on the imaging performance for a computed radiographic system under identical exposure condition. Digital radiographies using a 20-cm Lucite phantom were performed without grid and with grid ratios of 5:1, 8:1, 10:1, 12:1, and 14:1. The scatter fraction, the incident dose to the image receptor, the Wiener spectrum (WS), and the noise-equivalent quanta (NEQ) were measured. Visibility of low-contrast signals was evaluated using a contrast-detail phantom. The scatter fractions decreased considerably with an increase in the grid ratio. On the other hand, the WSs were increased (the noise property deteriorated) as the grid ratio increased due to a decreased incident dose to the image receptor under the identical exposure condition. The NEQs were improved as the grid ratio increased. The high grid ratios provided higher low-contrast detectability compared to the low grid ratios. Our results indicated that the removal of scattered radiation was very effective in improvement of the NEQ in the digital system under the identical exposure condition.

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Einfluss von Tandemoptik und Fernsehaufnahmeröhre moderner Durchleuchtungsanlagen auf die Bildqualität

Kunz

Britzen

Busch

2001

Zeitschrift für Medizinische Physik

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Physical and clinical evaluation of a 2,048 × 2,048-matrix image intensifier TV digital imaging system in bone radiography

Cited by 5 publications

References 12 publications

Digital magnification mammography with matched incident exposure: physical imaging properties and detectability of simulated microcalcifications

Digital magnification mammography with matched incident exposure: physical imaging properties and detectability of simulated microcalcifications

Investigation of optimum anti-scatter grid selection for digital radiography: physical imaging properties and detectability of low-contrast signals

Einfluss von Tandemoptik und Fernsehaufnahmeröhre moderner Durchleuchtungsanlagen auf die Bildqualität

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