av ULF NYMAN — vänder vi därför absorberad dos i milligray (mGy) för att skat- ta risken för Datortomografi av torax, medeldos Sverige 2006 (CTDIvol 10 mGy) [47]. 151.

CTDIvol Notification Value (mGy) Adult Head 80 Adult Torso 50 Pediatric Head <2 years old 2 – 5 years old 50 60 Pediatric Torso <10 years old (16-cm phantom; GE, Hitachi, Toshiba) <10 years old (32-cm phantom; Siemens, Philips) 25 10 Brain Perfusion (exam series that repeatedly scans same anatomic level to

編輯私有筆記及自訂標籤. 2016年11月13日 尿路造影的CTDIvol虽然仅为20 mGy，但DLP却高达2 620 mGy·cm。 结论 我国现 有的CT剂量水平与国际相关组织发布的诊断标准水平（DRL）  18 CTDI : CT Dose Index (CTDI) is the measure of ionizing radiation in the Body and to estimate radiation risk DLP= CTDIVOL x scan length (mGy.cm) A way  2016年11月7日 mGy是描述辐射能量与人体组织作用时使用一个单位，因此它表示组织单位 1.2 CT剂量指数（CTDI） CT剂量指数（CTDI）是用模型测量得到  CTDIvol and the scan length.11,17. DLP is measured in mGy cm and quantifies the total amount of radiation used to perform a given CT scan. In helical CT  Results: There was no significant difference (p < 0.05) between DECT and SECT: Mean CTDIvol was 14.2 mGy (±3.9). (DECT) and 14.3 mGy (±4.5) (SECT). 1.

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DLP is the CTDI (vol) multiplied by the scan length in centimeters and is given in units of mGy–cm. CTDIvol reported by scanner (mGy) for the protocol entered in the phantom site scanning data form (Note that this field is optional. This data may be entered into the dose calculation form and the database will calculate the percent difference between the calculated CTDI vol and that reported by the scanner. Beginning January 1, 2008, the ACR CT reference levels were changed to a CTDIvol of 75 mGy (adult head), 25 mGy (adult abdomen) and 20 mGy (pediatric abdomen) 15. These values will be reassessed periodically. CT Diagnostic Reference Levels for Other CT Applications Therefore, DLP (mGy-cm) = CTDIvol (mGy) x irradiated length (cm) (irradiated length is usually longer than imaged length in helical scanning) CTDIw and CTDIvol are independent of scan length for determining the total energy absorbed whereas DLP is proportional to scan length.

DSN DLP; DSN CTDIVol 32 33 34 35 Antal registreringar DSN DLP (mGy·cm) 25 50 75 100 125 150 175 200 225 250 275 300 325 350 375 400 425 450 475 

Dose Length Product (DLP). • DLP is a proxy for the total absorbed dose in a phantom over the length  For most standard scanning protocols, CTDIw is in the range 10–40 mGy (Table 7.3).

Head Routine CTDIvol[mGy] 60 60 75 Thorax Routine CTDIvol[mGy] 10 30 N/A Abdomen Routine CTDIvol[mGy] 15 35 25 1Bundesamt für Strahlenschutz (Diagnostische Referenzwerte für diagnostische und interventionelle Röntgenanwendungen vom 22.06.2016). 2European Guidelines on Quality Criteria for Computed Tomography

Notes: For children <1 year and 1-9 years, all studies performed with CTDIvol ≥ 20.1 mGy (range: 9-46 mGy) and CTDIvol ≥ 27.5 mGy (range: 15-60 mGy) yielded images of diagnostic quality. All diagnostic studies had a minimum CNR of 1.4.

Once the CTDI vol values are measured on a particular CT scanner by the manufacturer, they are stored in a table and can be computed from the technique factors used to scan the patient. Here is a simple calculator to compute the Effective Dose (mSv) from the Dose Length Product (mGy cm) for a CT exam of a single organ.
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2European Guidelines on Quality Criteria for Computed Tomography The technical parameters obtained were kVp, mA, scan range (cm), computed tomography dose index (CTDIvol), display field of view (DFOV) and dose length product (DLP). Effective dose (ED), defined as the product of DLP by an ED normalized weighting factor k (mSv.mGy-1.cm −1) (8) was also obtained. CTDIvol [mGy] 15 . 10 : 30 . N/A: Abdomen Routine CTDIvol [mGy] 15 : 15 .

CTDIvol: 5.4 mGy: DLP: 74.9 mGy•cm: Effective Dose* 1.05 mSv *AAPM Report 96, k-factor 0.014. Cardiac TAVI planning Aquilion ONE / GENESIS SP. 83-year-old female CTDIvol = (1/3)CTDI. 100 (center) + (2/3) CTDI. 100 (periphery) Table II. CTDI.
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CTDIvol: 5.4 mGy: DLP: 74.9 mGy•cm: Effective Dose* 1.05 mSv *AAPM Report 96, k-factor 0.014. Cardiac TAVI planning Aquilion ONE / GENESIS SP. 83-year-old female

Uppskattad CTDIvol (mGy):. Uppskattad DLP (mGycm):. Uppskattad total effektiv dos (mSv):. Genomlysning/angiografi/interventionsprocedur. Undersökningens  av E Larsson · 2017 — Referensvärdet för DT-thorax uppmättes till ett CTDIvol på 4 mGy.

Head Routine CTDIvol[mGy] 60 60 75 Thorax Routine CTDIvol[mGy] 10 30 N/A Abdomen Routine CTDIvol[mGy] 15 35 25 1Bundesamt für Strahlenschutz (Diagnostische Referenzwerte für diagnostische und interventionelle Röntgenanwendungen vom 22.06.2016). 2European Guidelines on Quality Criteria for Computed Tomography

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