Bladder and rectum volume estimations using CT and stereology

Mazonakis, Michalis; Damilakis, John; Varveris, H.

doi:10.1016/s0895-6111(98)00027-5

Cited by 18 publications

(18 citation statements)

References 23 publications

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“…Several studies have reported that the application of a stereological technique on CT scans may provide unbiased organ volume estimations [15][16][17][18][19][20][21]. Van der Worp et al have performed stereological assessments of the intracranial cavity volume [21].…”

Section: Introductionmentioning

confidence: 99%

Stereological estimation of total intracranial volume on CT images

et al. 2004

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This study aims to investigate the possibility of generating stereological estimations of total intracranial volume (TIV) on CT scans. The study group included 16 consecutive patients referred for a cranial CT examination. The TIV was estimated using the stereological point counting technique. Volume measurements were optimized by systematically sampling CT sections and by defining an optimum spacing between test points of the grid. The intraobserver and interobserver variability of the optimized volumetric technique was determined. Stereological TIV estimations were compared with the respective planimetric measurements. The application of a test grid with a point spacing of 2.4 cm on 6-8 systematically sampled CT sections provided TIV estimations with a coefficient of error of less than 5%. The intraobserver and interobserver coefficient of variation values were found to be 2.4 and 4.0%, respectively. The 95% limits of agreement between stereological and planimetric TIV measurements were equal to -91.4 and 103.4 cm3. The mean time (+/- SD) needed to obtain stereological TIV estimations was 2.9 +/- 0.6 min. The application of the optimized stereological technique on CT scans enables the efficient estimation of TIV.

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Section: Introductionmentioning

confidence: 99%

Stereological estimation of total intracranial volume on CT images

et al. 2004

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“…The increase in point spacing resulted in a considerable reduction in the number of counted points and, therefore, in a reduction of the time required. The mean time needed to estimate EDV with a point spacing of 10,15,20,25,30, and 35 pixels was equal to 3.7, 2.2, 1.6, 1.2, 1.1, and 0.9 min, respectively. The corresponding times for ESV estimation were 2.0, 1.1, 1.0, 0.9, 0.9, and 0.8 min, respectively.…”

Section: Optimization Of Stereological Methodsmentioning

confidence: 99%

“…Stereological volume measurements are based on the simple procedure of point counting and manual or semiautomatic segmentation of endocardial contours is not required. The stereological method has been successfully employed to provide efficient volume estimations of infarct and brain compartments [19], intracranial cavity [20,21], intravertebral disc [22], liver [23], lung [24], and urinary bladder [25] from CT scans. Cardiac function has been evaluated by applying the stereological method on MR images [26,27].…”

Section: Introductionmentioning

confidence: 99%

Stereological estimation of left-ventricular volumetric and functional parameters from multidetector-row computed tomography data

et al. 2008

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This study aims to optimize the stereological method for estimating left-ventricular (LV) parameters from retrospectively electrocardiography-gated 16-row MDCT and to compare stereological estimations with those by MRI. MDCT was performed in 17 consecutive patients with known or suspected coronary disease. Stereological measurements based on point counting were optimized by determining the appropriate distance between grid points. LV parameters were evaluated by standard CT analysis using a semi-automatic segmentation method. Two independent observers evaluated the reproducibility of the stereological method. End-diastolic volume (EDV) and end-systolic volume (ESV) estimations with a coefficient of error below 5% were obtained in a mean time of 2.3 +/- 0.5 min with a point spacing of 25 and 15 pixels, respectively. The intra- and interobserver variability for estimating LV parameters was 2.6-4.4 and 4.9-8.2%, respectively. MRI estimations were highly correlated with those by standard CT analysis (R > 0.82) and stereology (R > 0.84). Stereological method significantly overestimated EDV and ESV compared to MRI (EDV: P = 0.0011; ESV: P = 0.0013), whereas for stroke volume (SV) and ejection fraction (EF), no difference was observed (P > 0.05). For standard CT analysis and MRI, significant differences were found except for SV and EF (EDV: P = 0.0008; ESV: P = 0.0004; EF: P = 0.051; SV: P = 0.064). The time-efficient optimized stereological method enables the reproducible evaluation of LV function from MDCT.

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“…Son yıllarda radyolojik tetkiklerden elde edilen görüntüler üzerinde Cavalieri ilkesine dayalı hacim hesaplama yöntemi kullanılarak, gerçekte üç boyutlu olan her yapının hacminin etkin ve tarafsız bir biçimde ölçüldüğü ve iki boyutlu görüntülerden kaynaklanan hatalardan uzak bir değerlendirmenin yapılabileceği gösterilmiştir (22,(23)(24)(25)(26). Cavalieri yönteminde önce ilgilenilen yapıdan, nesnenin tümünü kapsayacak şekilde, birbirine paralel kesitler alınır.…”

Section: Gereç Ve Yöntemunclassified

Comparison Of Cavalieri Method With The Formula In Calculation Of Liver Volume In Magnetic Resonance Imaging

Yaşar¹,

İmamoğlu²,

Adam³

et al. 2011

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ÖZETAmaç: Karaciğer hacim ölçümlerinin Cavalieri yöntemiyle veya basit formüle dayalı ölçüm yöntemiyle elde eldilen sonuçlarının karşılaştırılması.Gereç ve Yöntem: Çalışma, hepatomegalisi veya karaciğerde yer kaplayıcı lezyonu olmayan 36 kişinin T2 ağırlıklı üst karın aksiyel manyetik rezonans (MR) kesitlerinde gerçekleştirildi. MR görüntülemesi Philips Achieva 1.5 Tesla MR cihazında alınan 7 mm kesit kalınlığı ve 1.5 mm kesit aralığında uygulandı . Karaciğerin hacmi iki farklı gözlemci tarafından Cavalieri ilkesine dayanan noktalı alan ölçüm yöntemi; ve karaciğerin belirli bir geometrik şekli (dörtkenarlı) olduğunu varsayan formüle dayalı yöntemi ile (A × B × C × 1/3) hesaplandı. Cavalieri yönteminde kesit kalınlığının oluşturduğu olumsuz etkiyi gidermek için hata katsayısı %0.05'in altında olacak şekilde matematiksel düzeltme işlemi gerçekleştirildi. Gözlemciler arası uyum ve yöntemlerin ürettiği sonuçlar arasındaki ilişki istatistiksel olarak incelendi. Bulgular: Cavalieri yöntemiyle yapılan ölçümlerde gözlemciler arasındaki uyum oldukça yüksektir (R=0,98). Formüle dayanan hesaplamada kullanılan çizgisel ölçümler için gözlemciler arası uyumlar da yüksek bulundu (R>0,94). Formüle dayalı ve Cavalieri yöntemiyle yapılan hesaplamaların ilişkisi orta-iyi derecedeydi (R=0,72).Sonuç: Formüle dayalı hesaplamalar daha pratik olmasına rağmen, karaciğerin büyüklüğü kabaca takmin edilebilir. Karaciğer büyüklük izleminin duyarlılıkla yapılması gereken durumlarda ve hepatomegali tanısı için arada kalınan olgularda Cavalieri yönteminin kullanılması daha akılcı bir yaklaşım olacaktır.

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Bladder and rectum volume estimations using CT and stereology

Cited by 18 publications

References 23 publications

Stereological estimation of total intracranial volume on CT images

Stereological estimation of total intracranial volume on CT images

Stereological estimation of left-ventricular volumetric and functional parameters from multidetector-row computed tomography data

Comparison Of Cavalieri Method With The Formula In Calculation Of Liver Volume In Magnetic Resonance Imaging

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