Advanced multiple-beam equalization radiography in chest radiology: a simulated nodule detection study.

Kool, Leo J. Schultze; Busscher, D. L. T.; Vlasbloem, Hugo; Hermans, J; Merwe, P C vd; Algra, Paul R.; Herstel, W

doi:10.1148/radiology.169.1.3420280

Cited by 30 publications

(7 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…An early attempt at overcoming poor lesion conspicuity was equalization radiography (61,62). Equalization was developed to improve the visibility of lesions in dense regions of the chest such as the mediastinum and the retrocardiac and retrodiaphragmatic areas.…”

Section: Application Developmentsmentioning

confidence: 99%

“…This process forced all of the thoracic regions into the higher-contrast "linear" portion of the film response curve. Studies indicated significantly improved detection of lesions when equalization was used (62,63). Despite its promise, equalization has largely disappeared from clinical use because of the edge-enhanced appearance imposed on the images, which some found difficult to interpret, and also because of the more recent transition to digital imaging and away from screen-film radiography.…”

Section: Application Developmentsmentioning

confidence: 99%

See 1 more Smart Citation

Recent Advances in Chest Radiography

McAdams¹,

Samei²,

Dobbins³

et al. 2006

Radiology

182

View full text Add to dashboard Cite

There have been many remarkable advances in conventional thoracic imaging over the past decade. Perhaps the most remarkable is the rapid conversion from film-based to digital radiographic systems. Computed radiography is now the preferred imaging modality for bedside chest imaging. Direct radiography is rapidly replacing film-based chest units for in-department posteroanterior and lateral examinations. An exciting aspect of the conversion to digital radiography is the ability to enhance the diagnostic capabilities and influence of chest radiography. Opportunities for direct computer-aided detection of various lesions may enhance the radiologist's accuracy and improve efficiency. Newer techniques such as dual-energy and temporal subtraction radiography show promise for improved detection of subtle and often obscured or overlooked lung lesions. Digital tomosynthesis is a particularly promising technique that allows reconstruction of multisection images from a short acquisition at very low patient dose. Preliminary data suggest that, compared with conventional radiography, tomosynthesis may also improve detection of subtle lung lesions. The ultimate influence of these new technologies will, of course, depend on the outcome of rigorous scientific validation.

show abstract

Section: Application Developmentsmentioning

confidence: 99%

Section: Application Developmentsmentioning

confidence: 99%

Recent Advances in Chest Radiography

McAdams¹,

Samei²,

Dobbins³

et al. 2006

Radiology

182

View full text Add to dashboard Cite

show abstract

“…This method, namely exposure equalization, results in an increased exposure to the heavily attenuating regions and decreased exposure to the lightly attenuating regions. Several exposure equalization techniques have been implemented and investigated in the past (Peppler et al , 1982; Hasegawa et al , 1986; Hasegawa et al , 1987; Boone et al , 1993; Boone et al , 1995; Goodsitt et al , 1998; Rudin and Bednarek, 1980; Rudin et al , 1999; Fletcher et al , 1996; Molloi et al , 1999; Molloi et al , 2001; Lam and Chan, 1990; Vlasbloem and Kool, 1988; Chotas et al , 1990; Plewes and Wandtke, 1982; Plewes and Vogelstein, 1983; Wandtke et al , 1988; Kool et al , 1988; Panayiotakis et al , 1998; Sabol et al , 1993; Sabol et al , 1996;), all of which have demonstrated improved image quality particularly in the heavily attenuating regions. Exposure equalization radiography may be divided into two categories: those based on conventional full-field image acquisition and those based on spot-/slot-scan imaging geometry.…”

Section: Introductionmentioning

confidence: 99%

“…The scanning equalization radiography (SER) (Lam and Chan, 1990; Vlasbloem and Kool, 1988; Chotas et al , 1990; Plewes and Wandtke, 1982; Plewes and Vogelstein, 1983; Wandtke et al , 1988; Kool et al , 1988) on the other hand, employs spot-/slot-scan geometry to regulate the entrance exposure regionally while it rejects the scattered radiation effectively. Spatially and temporarily varying beam height or x-ray tube current pulse width modulation can be used to achieve exposure equalization during the scan.…”

Section: Introductionmentioning

confidence: 99%

Scan equalization digital radiography (SEDR) implemented with an amorphous selenium flat-panel detector: initial experience

et al. 2009

View full text Add to dashboard Cite

It is well recognized in projection radiography that low-contrast detectability suffered in heavily attenuating regions due to excessively low x-ray fluence to the image receptor and higher noise levels. Exposure equalization can improve image quality by increasing the x-ray exposure to heavily attenuating regions, resulting in a more uniform distribution of exposure to the detector. Image quality is also expected to be improved by using the slot-scan geometry to reject scattered radiation effectively without degrading primary x-rays. This paper describes the design of prototype scan equalization digital radiography (SEDR) system implemented with an amorphous silicon (a-Si) thin-film transistor (TFT) array based flat-panel detector. With this system, the slot-scan geometry with the alternate line erasure and readout (ALER) technique was used to achieve scatter rejection. A seven-segment beam height modulator assembly was mounted onto the fore-collimator to regulate exposure regionally for chest radiography. The beam modulator assembly, consisting of micro linear motors, lead screw cartridge with lead beam blocks attached, position feedback sensors, and motor driver circuitry, has been tested and found to have an acceptable response for exposure equalization in chest radiography. An anthropomorphic chest phantom was imaged in the posterior-anterior (PA) view under clinical conditions. Scatter component, primary x-rays, scatter-to-primary ratios (SPRs), and primary signal-to-noise ratios (PSNRs) were measured in the SEDR images to evaluate the rejection and redistribution of scattered radiation, and compared with those for conventional full-field imaging with and without anti-scatter grid methods. SPR reduction ratios (SPRRRs, defined as the differences between the non-grid full-field SPRs and the reduced SPRs divided by the former) yielded approximately 59% for the full-field imaging with grid and 82% for SEDR technique in the lungs; and 77% for the full-field imaging with grid and 95% for SEDR technique in the subdiaphragm. The SEDR technique demonstrated a substantial improvement in PSNRs over the anti-scatter grid technique. The improvements of PSNRs are varied with the regions and are more pronounced in the heavily attenuating regions.

show abstract

“…Die AMBER-Technik -Erstbeschreiber Vlasbloem U . Schultze Kool (1988) -löst dieses Problam durch einen Belichstrahlendichten Organen hoch gehalten. Dadurch können sowohl die vom Mediastinum und Zwerchfell überlager-ten als auch die iiberlagerui~gsfreien Lungeiiabschnitte im optimalen Dynamikbereich des Röntgenfilms dargestellt werden.…”

unclassified

Stellenwert des AMBER-Systems beim Nachweis von intrathorakalen Raumforderungen

Bitzer

Strayle²,

Schäfer³

et al. 1993

Fortschr Röntgenstr

View full text Add to dashboard Cite

Since October 1991 the AMBER technique has been used for the diagnosis of chest diseases in about 4,000 patients. The ability of this technique, compared with conventional methods, for demonstrating intrathoracic masses on p.a. views has been assessed. Amongst the patients there were 43 with coin lesions, 18 with hilar and 33 with mediastinal masses. ROC analysis showed the AMBER technique to be superior in demonstrating coin lesions (AMBER 0.92, conventional 0.85) and mediastinal masses (AMBER 0.89, conventional 0.73). There was a small, statistically not significant, disadvantage in the AMBER technique for demonstrating hilar masses (AMBER 0.80, conventional 0.84).

show abstract

Advanced multiple-beam equalization radiography in chest radiology: a simulated nodule detection study.

Cited by 30 publications

References 0 publications

Recent Advances in Chest Radiography

Recent Advances in Chest Radiography

Scan equalization digital radiography (SEDR) implemented with an amorphous selenium flat-panel detector: initial experience

Stellenwert des AMBER-Systems beim Nachweis von intrathorakalen Raumforderungen

Contact Info

Product

Resources

About