The effects of gantry tilt on breast dose and image noise in cardiac CT

Hoppe, Michael E.; Gandhi, Diksha; Stevens, Grant M.; Foley, W D; Schmidt, Taly Gilat

doi:10.1118/1.4829521

Cited by 3 publications

(1 citation statement)

References 23 publications

(30 reference statements)

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“…Faktor yang kedua adalah efisiensi scanning (misalnya, efisiensi detektor kuantum, efisiensi geometri detektor, rasio amber-penumbra), dan faktor yang ketiga pasien (ukuran pasien, jumlah tulang dan jaringan lunak pada bidang pemindaian). Selain ketiga faktor tersebut, menurut Hoppe (2013) pada jurnal yang diterbitkan oleh American Assosiation of Physicists in Medicine, dengan perlakuan perubahan sudut gantry 0 0 sampai dengan 30 0 pada rentang 5 0 akan meningkatkan 2% -50% noise standar deviasi. Demikian juga pada penelitian yang dilakukan oleh Nikupaavo (2015) pada jurnal yang diterbitkan oleh AJR menunjukkan bahwa kemiringan sudut gantry dapat meningkatkan noise yang di hasilkan sebesar 30% pada citra yang dihasilkan.…”

Section: Pendahuluanunclassified

Pengaruh Perubahan Sudut Gantry Terhadap Noise Pada Pemeriksaan Ct Scan Dengan Teknik Sequence

Akhsani¹,

Rusyadi

Fatimah

2019

jri

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Background: Noise is a fluctuation in the value of CT number and Standard Deviation which is one parameter in the assessment of CT Scan image quality. This study aims to see the effect of changes in the angle of the gantry on noise and conformity with the BAPETEN standard of the value of the CT Number and Standard Deviation fluctuations produced. Methods: This type of research is quantitative with an experimental approach. The research subjects used water phantom to assess the value of CT Number and Standard Deviation by placing ROI on the resulting image. The SPSS test is used to see the relationship between changes in noise and noise. CT Number, Uniformity and Noise Uniformity tests are performed to assess CT Number and Standard Deviation in accordance with BAPETEN regulations. Results: An increase in noise is indicated by fluctuations in the value of CT Number and Standard Deviation resulting from the placement of the ROI at the center of each image produced by each change in the angle of the gantry. The average value of CT Number at the gantry angle 00 (-1.43), 50 (-1.48), 100 (-1.47), 150 (-1.58), 200 (-1.62), 250 (-1.68), 300 (-1.7). The average value of the Standard Deviation at the 00 gantry angle (2.36), 50 (2.35), 100 (2,3), 150 (2,33), 200 (2,42), 250 (2,57), 300 (2.62). There is a significant relationship to the Pearson correlation test between changes in gantry angle and CT Number and Standard Deviation values. CT Number, Uniformity, and Noise Uniformity Test results were used to assess the fluctuations of CT Number and Standard Deviation due to changes in the angle of the gantry in accordance with the standard BAPETEN No. 2 of 2018 on all changes in the 00 gantry angle to -300 with a range of 50. Conclution:. Noise fluctuations are caused by changes in the thickness of the scanning area object from changes in the gantry angle. The greater the change in angle of the gantry, the greater the thickness of the scanning area object. Changing the gantry angle causes the scanning area to change from the circle to the ellipse.

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Section: Pendahuluanunclassified

Pengaruh Perubahan Sudut Gantry Terhadap Noise Pada Pemeriksaan Ct Scan Dengan Teknik Sequence

Akhsani¹,

Rusyadi

Fatimah

2019

jri

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Validation of a MOSFET dosemeter system for determining the absorbed and effective radiation doses in diagnostic radiology

Manninen

Kotiaho

Nikkinen

et al. 2014

Radiation Protection Dosimetry

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This study aimed to validate a MOSFET dosemeter system for determining absorbed and effective doses (EDs) in the dose and energy range used in diagnostic radiology. Energy dependence, dose linearity and repeatability of the dosemeter were examined. The absorbed doses (ADs) were compared at anterior-posterior projection and the EDs were determined at posterior-anterior, anterior-posterior and lateral projections of thoracic imaging using an anthropomorphic phantom. The radiation exposures were made using digital radiography systems. This study revealed that the MOSFET system with high sensitivity bias supply set-up is sufficiently accurate for AD and ED determination. The dosemeter is recommended to be calibrated for energies <60 and >80 kVp. The entrance skin dose level should be at least 5 mGy to minimise the deviation of the individual dosemeter dose. For ED determination, dosemeters should be implanted perpendicular to the surface of the phantom to prevent the angular dependence error.

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Lateral Position With Gantry Tilt Further Improves Computed Tomography Image Quality Reconstructed Using Single-Energy Metal Artifact Reduction Algorithm in the Oral Cavity

Onodera

Aratani²,

Shonai

et al. 2020

J Comput Assist Tomogr

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Objective To assess the limitations of single-energy metal artifact reduction algorithm in the oral cavity and evaluate the availability of a solution by setting the patient in a lateral position (LP) with the use of a gantry tilt (GT). Methods We analyzed 88 patients with dental metals retrospectively in study 1, and 74 patients prospectively in study 2. Patients were classified: metal I with dental metals in 1 region, metal II in 2 regions, and metal III in 3 regions. Patients underwent neck computed tomography examinations in a supine position (SP) in study 1, and 2 positions, an LP with a GT and an SP, in study 2. All images were reconstructed with this algorithm. Image quality was scored using a 4-point scale: 1 = severe artifact, 2 = moderate artifact, 3 = slight artifact, 4 = no artifact. The scores were compared between metal I, metal II, and metal III using the Mann-Whitney U test in study 1, and between an LP with a GT and an SP using the Wilcoxon signed ranks test in study 2. Results The scores outside the dental arch were significantly higher in metal I than in metal II and metal III (3.0 ± 0.6 vs 2.3 ± 0.5 vs 2.2 ± 0.4; P < 0.0001 for metal I vs metal II and for metal I vs metal III) and significantly higher in an LP with a GT than an SP (3.2 ± 0.4 vs 2.3 ± 0.4; P < 0.0001). Conclusions Single-energy metal artifact reduction algorithm could reduce metal artifacts adequately in patients with dental metals in 1 region, but not in 2 or more regions. However, even for the latter, combination of this algorithm and an LP with a GT could further improve the image quality.

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The effects of gantry tilt on breast dose and image noise in cardiac CT

Cited by 3 publications

References 23 publications

Pengaruh Perubahan Sudut Gantry Terhadap Noise Pada Pemeriksaan Ct Scan Dengan Teknik Sequence

Pengaruh Perubahan Sudut Gantry Terhadap Noise Pada Pemeriksaan Ct Scan Dengan Teknik Sequence

Validation of a MOSFET dosemeter system for determining the absorbed and effective radiation doses in diagnostic radiology

Lateral Position With Gantry Tilt Further Improves Computed Tomography Image Quality Reconstructed Using Single-Energy Metal Artifact Reduction Algorithm in the Oral Cavity

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