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Titolo:
Effects of window and threshold levels on the accuracy of three-dimensional rendering techniques in coronary artery electron-beam CT angiography
Autore:
Lu, B; Dai, RP; Jiang, SL; Bal, H; He, S; Zhuang, N; Sun, XG; Budoff, MJ;
Indirizzi:
St Johns Cardiovasc Res Ctr, Torrance, CA 90502 USA St Johns Cardiovasc Res Ctr Torrance CA USA 90502 Torrance, CA 90502 USA Univ Calif Los Angeles, Harbor Med Ctr, Div Cardiol, Dept Med, Torrance, CA 90509 USA Univ Calif Los Angeles Torrance CA USA 90509 Med, Torrance, CA 90509 USA Peking Union Med coll, Fuwai Cardiovasc Inst & Hosp, Dept Radiol, Beijing,Peoples R China Peking Union Med coll Beijing Peoples R China , Beijing,Peoples R China Peking Union Med coll, Fuwai Cardiovasc Inst & Hosp, Dept Surg, Beijing, Peoples R China Peking Union Med coll Beijing Peoples R China Beijing, Peoples R China Chinese Acad Med Sci, Beijing 100037, Peoples R China Chinese Acad Med Sci Beijing Peoples R China 100037 037, Peoples R China
Titolo Testata:
ACADEMIC RADIOLOGY
fascicolo: 8, volume: 8, anno: 2001,
pagine: 754 - 761
SICI:
1076-6332(200108)8:8<754:EOWATL>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
SHADED SURFACE DISPLAY; COMPUTED-TOMOGRAPHY; SPIRAL CT; 3-DIMENSIONAL RECONSTRUCTION; NONINVASIVE ASSESSMENT; HEALTHY-SUBJECTS; HELICAL CT; STENOSES; PHANTOM; PATENCY;
Keywords:
Computed tomography (CT); electron beam; computed tomography (CT); image processing; coronary vessels; CT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Citazioni:
29
Recensione:
Indirizzi per estratti:
Indirizzo: Lu, B St Johns Cardiovasc Res Ctr, 1124 W Carson St,RB-2, Torrance, CA 90502 USA St Johns Cardiovasc Res Ctr 1124 W Carson St,RB-2 Torrance CA USA 90502
Citazione:
B. Lu et al., "Effects of window and threshold levels on the accuracy of three-dimensional rendering techniques in coronary artery electron-beam CT angiography", ACAD RADIOL, 8(8), 2001, pp. 754-761

Abstract

Rationale and Objectives. The authors performed this study to evaluate theeffect of window level and gray-scale threshold on the demonstration of coronary artery lumina at three-dimensional electron-beam computed tomographic (CT) angiography. Materials and Methods. Forty-four coronary artery branches in postmortem pigs were evaluated with electron-beam CT angiography, and the findings werecompared with those from conventional angiography. Images from electron-beam CT angiography were reconstructed with maximal intensity projection (MIP), multiplanar reformation (NMR), and shaded-surface display (SSD). Four categories of window level and gray-scale threshold were evaluated. Results. Three-dimensional electron-beam CT angiography accurately depicted the luminal diameters of the coronary arteries compared with conventionalangiography (r = 0.83-0.90, P < .0001). The length of lumina visualized atelectron-beam CT angiography was significantly shorter than that visualized with conventional angiography (P < .001). The use of NUR enabled visualization of longer segments of coronary arteries than did the use of MIP or SSD (P < .05). The higher the window level and gray-scale threshold used, thesmaller the coronary luminal diameters measured (P < .05). The most accurate window level and gray-scale threshold (82.6 HU +/- 29.8 and 89.5 HU +/- 29.7, respectively) were found to correspond to the attenuation of the lumina (275.8 HU +/- 58.8). Results of simple linear regression showed a strongcorrelation between luminal attenuation and window level (r = 0.89, P < .0001) or gray-scale threshold (r = 0.95, P < .0001). Conclusion. Electron-beam CT angiography shows promise in the visualization of coronary artery lumina. For accurate display of lumina, a proper window level and gray-scale threshold for three-dimensional rendering techniquesshould be determined and used on the basis of the attenuation of the target vessel.

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Documento generato il 21/01/20 alle ore 06:51:57