# CTDIvol = CTDIw / Pitch As expected, the larger the pitch, the lower the dose. Obviously there are disadvantages of high pitch, which are discussed in detail in the Helical CT section. Many institutions and governing bodies use CTDI vol as a quality-control measure.

Accurate adaptation of the estimated average Computed Tomography Dose Index (CTDIvol) by tuning the Image Quality Reference Parameter (noise index (NI)) with a simple formula Carola Brussaard , Aldo Scafoglieri , Gert Van Gompel , Bart Ilsen , Jan Pieter Clarys, Erik Cattrysse , Johan De Mey

112.The dose report a.displays the CTDI vol and DLP indices before and after the CT study is performed . b.is sent to PACS with the rest of the patient’s CT study The CTDIvol gives a good estimation of the average dose applied in the scanned volume, With this formula you can calculate the mAs/rotation for the SOMATOM Definition. Take the eff. mAs value from the SOMATOM Sensation 64 standard cardiac protocol (0.33 s rotation time and fixed pitch of 0.2). CTDIvol (mGy) =CTDIw*N*T/I DLP (mGy-cm) Release or disclosure of this document is prohibited in accordance with Code of Virginia 8.01-581.17 This document is copyright protected by the American College of Radiology.

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CTDIvol = CTDIw / Pitch As expected, the larger the pitch, the lower the dose. Obviously there are disadvantages of high pitch, which are discussed in detail in the Helical CT section. Many institutions and governing bodies use CTDI vol as a quality-control measure. The formula is:CTDIvol = (N)(T)(CTDIw)/IwhereN = number of simultaneous axial scans per x-ray source rotation, T = thickness of one axial scan (mm), and Sample 1 Sample 2 2017-09-19 CTDIvol (mGy) is obtained by dividing CTDI w by pitch factor. Another commonly used index is the dose-length product (DLP) which factors in the length of the scan to show overall dose output DLP (mGy*cm) CTDI vol x scan length 2020-12-08 FRCR Physics Notes: Units of dose, CT Dose Index (CTDI), weighted CTDI (CTDIw), volume CTDI (CTDIvol), dose length product (DLP), effective dose and factors affecting dose. (0018,9345) CTDIvol: 3: Double (0018,9346) CTDI Phantom Type Code Sequence: 3: Sequence (0018,9351) Calcium Scoring Mass Factor Patient: 3: Single (0018,9352) Calcium Scoring Mass Factor Device: 3: Single (0018,9353) Energy Weighting Factor: 1C: Single (0018,9360) CT Additional X-Ray Source Sequence: 3: Sequence (0018,9361) Multi-energy CT Acquisition: 3: Code String It is related to volume CT dose index (CTDIvol), but CTDI vol represents the dose through a slice of an appropriate phantom. DLP accounts for the length of radiation output along the z-axis (the long axis of the patient).

June 2013; Medical Physics 40(6):404 2014-02-01 CT Dose Reporting: Starting on July 1, 2012, new California legislation requires that specific CT scanner dose metrics be included in the radiology report, for all patients undergoing diagnostic CT scans.

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13 Dec 2014 CTDIvol is not patient dose • The relationship between the two depends on many factors, including patient size and composition • AAPM Report CT Dose Index (CTDI) The formula for this calculation is shown in the illustration. If the CTDI within a single slice is 4 rads what is the dose if 10 slices are Computed Tomography Dose Index (CTDIvol), in mGy according to IEC 60601-2- 44, Ed.2.1 (Clause 29.1.103.4), The Volume CTDIvol. It describes the average 6 Nov 2014 Fórmula Nº 7. El CTDIvol “Índice de Dosis Volumétrica en Tomografía Computarizada” se definirá como el CTDIw ponderado dividido por el 24 Oct 2017 This function facilitates the simple calculation of the lower dose to the central Though CTDIvol (and Deq_ave) are useful for characterizing CT When the CTDI quantity was calculated in terms of the integral over the length of phantom, from −L2 to +L2 following the equation 1 [21] .

### (0008,9207), Volume Based Calculation Technique, CS, 1. (0008,9208), Complex (0018,9346), CTDI Phantom Type Code Sequence, SQ, 1. (0018,9351)

In the case of the whole-body phantom, the differences between the measured and displayed values varied between -31 and +24% [European document RP162 (2012) sets up the limit for … CTDIvol formula. CTDIvol = CDTIw/pitch. As the pitch increases. dose per section (CTDIvol) decreases. CTDIvol is similar in principle to an older term used for conventional step-and-shoot scanning. multiple scan average dose (MSAD.

(0018,9351)
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3 Aug 2019 confirmed large variability in CTDIvol and DLP for cardiac CT scans; variation was associated where CTDIvol is calculated from Formula 2. 2. phantoms and calculation of individualised patient dose using Monte Carlo and model To estimate the average dose in the axial plane CTDI equation (2) is 9 Sep 2019 CTDIvol = (1/pitch) x CTDIw. represents the dose for a specific scan protocol which takes into account gaps and overlaps between the radiation 6 Dec 2019 Size correction factors to calculate SSDE were derived based on the conventional weighted CT dose index (CTDIw) equation. This study aims Chapter 8: Dose Equations for Shift-Variant CT Acquisition Modes Using Variable Pitch, Tube Current, and Aperture, and the Meaning of their Associated CTDIvol.

Computed tomography dose index (CTDIvol) values were calculated according to the IEC 60601-2-44:1999 formula. The measured CTDIvol doses were compared with those preprogrammed by the manufacturer. In the case of the whole-body phantom, the differences between the measured and displayed values varied between -31 and +24% [European document RP162 (2012) sets up the limit for acceptance criterion
Purpose: To critically examine the assumptions leading to the formula for CTDIVOL, which uses measured CTDI values at the center and periphery to estimate the overall average dose to a homogeneous
The feasibility of a scanner-independent technique to estimate organ dose from MDCT scans: using CTDIvol to account for differences between scanners. Med Phys 2010;37(4):1816–1825.

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### 9 Sep 2019 CTDIvol = (1/pitch) x CTDIw. represents the dose for a specific scan protocol which takes into account gaps and overlaps between the radiation

Take the eff. mAs value from the SOMATOM Sensation 64 standard cardiac protocol (0.33 s rotation time and fixed pitch of 0.2).

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