Optimal biplane imaging of coronary segments with computed triple orthogonal projections

Wollschläger, H; Zeiher, Andreas M.; Lee, P.; Solzbach, U.; Bonzel, T.; Just, Hanjörg

doi:10.1007/978-94-009-1309-7_2

Cited by 8 publications

(2 citation statements)

References 4 publications

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“…This error can be circumvented by out-of-plane correction as proposed by Wollschlager et al [21] or by calibration at the isocenter of the X-ray system.…”

Section: Calibrationmentioning

confidence: 99%

In vivo validation of an experimental adaptive quantitative coronary angiography algorithm to circumvent overestimation of small luminal diameters

Keane

Gronenschild

Slager

et al. 1995

Cathet. Cardiovasc. Diagn.

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The reliability of quantitative coronary angiography (QCA) measurements is of fundamental importance for the study and practice of interventional cardiology. In vivo validation results have consistently reported a tendency for QCA systems to overestimate small luminal diameters. Such a systematic error may result in the underestimation of luminal gain during intracoronary procedures and in the underestimation of progression of coronary artery disease during longitudinal studies. We report the in vivo validation results of an experimental adaptive edge-detection algorithm that was developed to reduce overestimation of small luminal diameters by incorporating a dynamic function of variable kernel size of the derivative operator and variable weighting of the first and second derivatives of the brightness profile. The results of the experimental algorithm were compared to those of the conventional parent edge detection algorithm with fixed parameters. Dynamic adjustment of the edge-detection algorithm parameters was found to improve measurements of small (< 0.8-mm) luminal diameters as evidenced by an intercept of +.07 mm for the algorithm with variable weighting compared to +0.21 mm for the parent algorithm with fixed weighting. A slope of < 1 was found for both the parent and experimental algorithms with subsequent underestimation of large luminal diameters. Systematic errors in a QCA system can be identified and corrected by the execution of objective in vivo validation studies and the consequent refinement of edge-detection algorithms. The overestimation of small luminal diameters may be overcome by the incorporation of a dynamic edge-detection algorithm.(ABSTRACT TRUNCATED AT 250 WORDS)

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“…This error can be circumvented by out-of-plane correction as proposed by Wollschlager et al [21] or by calibration at the isocenter of the X-ray system.…”

Section: Calibrationmentioning

confidence: 99%

In vivo validation of an experimental adaptive quantitative coronary angiography algorithm to circumvent overestimation of small luminal diameters

Keane

Gronenschild

Slager

et al. 1995

Cathet. Cardiovasc. Diagn.

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“…Οι πυκνομετρικές τ€χνικές (172,175,176), όπως επίσης και η λήψη ορθογωνίων προβολών καθέτων προς τον επιμήκη άξονα του στενωμένου τμήματος με τη βοήθεια του ηλεκτρονικού υπολογιστή (τριπλή ορθογωνικότητα) (177,178), οι οποίες προσφέρονται για την επίλυση των περισσοτέρων προβλημάτων στην ερμηνεία της στεφα νιαίας αρτηριογραφίας, βελτιώνουν την ακρίβεια και την αναπαραγωγιμότητα των λαμβανομένων πληροφοριών.…”

Section: πυκνομετρικες τεχνικεςunclassified

Η Συνύπαρξη Της Καρωτιδικής Νόσου Σε Ασθενείς Με Στεφανιαία Νόσο

Σιδέρης¹

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Στη σύζυγο μου Γεωργία και στα παιδιά μου Άννα-Μαρία και Κωνσταντίνο Στους γονείς μου Στους δασκάλους μου 7 ΠΕΡΙΕΧΟΜΕΝΑ σελ. Βιογραφικό σημείωμα Επιστημονικές εργασίες -Δημοσιεύσεις-Ανακοινώσεις 10 Εισαγωγή ΓΕΝΙΚΟ ΜΕΡΟΣ 1. Αθηροσκλήρυνση 2. Οι φυσιολογικές αρτηρίες 3. Το ενδοθήλιο των αγγείων: Φυσιολογική λειτουργία και δυσλει τουργία 4. Κύτταρα που εμπλέκονται στη διεργασία της αθηροσκλήρυνσης 4.1. Το ενδοθήλιο 4.2. Τα λεία μυϊκά κύτταρα του αρτηριακού τοιχώματος 4.3. Τα μονοκύτταρα/μακροφάγα 4.4. Εξωκυττάρια θεμέλια ουσία 4.5. Αυξητικοί παράγοντες και κυτοκίνες 5. Η αθηρωματική πλάκα 39 5.1. Στάδια αθηροσκληρυντικής διεργασίας 5.2. Θεωρίες για την ανάπτυξη της αθηρωματικής πλάκας 47 6. Παράγοντες κινδύνου 48 6.1. Υπερλιπιδαιμία 49 6.2. Υπερχοληστερολαιμία 49 6.3. Υπερτριγλυκεριδαιμία 50 6.4. HDL-χοληστερόλη <35 mg/dL ή <45 mg/dL 51 6

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In‐vivo validation of on‐line and off‐line geometric coronary measurements using insertion of stenosis phantoms in porcine coronary arteries

Haase

Mario

Slager

et al. 1992

Cathet. Cardiovasc. Diagn.

118

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Geometric coronary artery measurements with the Phillips Digital Cardiac Imaging System (DCI) and the Cardiovascular Angiography Analysis System (CAAS) were validated using percutaneous insertion of radiolucent stenosis phantoms in swine coronary arteries. Angiographic visualization of the stenosis lumens (phi 0.5, 0.7, 1.0, 1.4, 1.9 mm) was simultaneously recorded on DCI and cinefilm. The acquisition systems were calibrated by either the diameter of the guiding catheter (catheter CAL) or the isocenter method (isocenter CAL). Minimal luminal diameters (MLD) obtained with CAAS and DCI on 20 corresponding cineframes were compared with the true phantom diameters (PD). The accuracy of MLD measurements with the CAAS using isocenter CAL was -0.07mm, the precision 0.21 mm (r = 0.91; y = 0.30 + 0.79x; SEE = 0.19), with catheter CAL the accuracy was 0.09 mm, the precision 0.23 mm (r = 0.89; y = 0.19 + 0.74x; SEE = 0.19). The accuracy of MLD measurements using the DCI with isocenter CAL was 0.08 mm, the precision 0.15 min (r = 0.96; y = 0.08 + 0.86x; SEE = 0.14), with catheter CAL the accuracy was 0.18 mm, the precision 0.21 mm (r = 0.92; y = 0.09 + 0.76x; SEE = 0.17). DCI underestimated PD with isocenter CAL (p less than 0.05) and with catheter CAL (p less than 0.001). MLD can be measured with high accuracy, both applying on-line digital as well as off-line cineangiographic analysis. The results of digital measurements demonstrate high reliability of the new digital software package.

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Optimal biplane imaging of coronary segments with computed triple orthogonal projections

Cited by 8 publications

References 4 publications

In vivo validation of an experimental adaptive quantitative coronary angiography algorithm to circumvent overestimation of small luminal diameters

In vivo validation of an experimental adaptive quantitative coronary angiography algorithm to circumvent overestimation of small luminal diameters

Η Συνύπαρξη Της Καρωτιδικής Νόσου Σε Ασθενείς Με Στεφανιαία Νόσο

In‐vivo validation of on‐line and off‐line geometric coronary measurements using insertion of stenosis phantoms in porcine coronary arteries

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