KfKi = W = mgy Wfriction EfEi = Kf –(Ki mgy) = Wfriction=fk⋅d ⋅cos180 °= = fk⋅d=mg µ⋅d ⋅cos18° Lecture 9 Andrei Sirenko, NJIT 14 Problems Lecture 9 Andrei Sirenko, NJIT 15 V2 =86 m/s What minimum coefficient of kinetic friction µk is required to bring the crate to a stop over a distance of 10 m along the lowerSimple and best practice solution for W=mg equation Check how easy it is, and learn it for the future Our solution is simple, and easy to understand,Table 1 Calculated Average CTDI w (mGy) for a range of kVp and mA settings (16cm CTDI phantom) Measurements of the machine output exposure (such as CTDI w) do not take into account other aspects of patient anatomy and positioning that can significantly alter the determination of the biological effect of the incident radiation
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W=mgy calculator-May 17, 05 · Calculated CTDI w (mGy) Doses estimated using the ImPACT calculator Open in new tab Table 2 Calculated equivalent dose H T (mSv) in the selected organs of the anthropomorphic phantoms and patientsAug 01, 17 · Focusing on CT kidneyureterbladder (CTKUB) procedures, this work was aimed at determining organ equivalent dose using a commercial CT dose calculator and providing an estimate of cancer risks The study, which included 64 patients (32 males and 32 females, mean age 555 years and age range 30–80 years), involved use of a calibrated CT
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Nov 01, 15 · The values tabulated here are normalized to the currenttime product, ie divided by 100 mA s CTDI w (mGy/100 mA s) Only the values obtained using the standard CTDI phantoms and 10 cm ion chamber are included in this tableThe distribution of papers published on measurement or calculation of imaging dose from CBCT in radiation therapy (05e14) The data is based on an advanced search of the ScopuscomCTDI w (mGy) Mean ± SD DLP (mGy*cm) Mean ± SD 75 th Percentile (Median value) Head 447 9 CT dosimetry software Impact CT patient dosimetry calculator, version 104 with
Important The slug is the base unit for mass in the English system, but the more common unit for mass is the Pound Mass (lbm)Under standard Earth gravity, 1 lbm weighs 1 lbf and therefore the term "pound" is usually used for both mass and weight in the English system MASS Conversions 1 lbm = * kg (exact conversion) 1 kg = lbm 1 slug = lbmInternational Journal of Scientific and Research Publications, Volume 9, Issue 5, May 19 842 ISSN2 700 (1400)(980 /)(0174) 3100 N kg m s N 1 550 746 ft lb hp W s W mgy P t t 2 (60)(980 /)(45) 660 40 kg m s m W s 660 0 746 / W hp W hp E Pt 660 660 / P W J s (660 / )(40 ) 2600 E J s
CTDI vol 402 mGy, DLP 42 mGy cm Table 1 Dose1reference levels from EUR (8) for CTexaminations Examination CTDI w (mGy) DLP (mGy cm) Brain, general 60 1050 Skull base a 60 1050 Face and sinuses b 35 360 Petrous bone a 60 1050 Orbits a 60 1050 Sella and hypophysis a 60 1050 Salivary glands a 60 1050 Pharynx a 60 1050 Larynx a 60CTDI w (mGy) per 100 mAs Pitch DLP (mGy cm) (H1) Philips Brilliance iCT BIG Bore, 128 slices 0 7 65 676 104 425 (H2) Philips Brilliance iCT BIG Bore, 128 slices 250 10 6 6 1 460 (H3) Philips Brilliance iCT BIG Bore, 128 slices 0 6 10 10 1 700 (H4) Philips Brilliance MX 16 slices 0 6 5 09 750 (H5)Jul 14, 12 · 2 Risk of Radiation Exposure Internatonal commision on radiological protection – IRCP estimates • Deterministic(high dose range) 250 – 500 mSv blood changes >4000 mSv 50% probability of death • Stochastic(low dose range)
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Where L is the total scan length DLP is measured in milligraycentimetres and it increases with an increase in total scan length or with variables that affect the CTDI w (eg tube current or voltage) or the CTDI volume (eg pitch) In clinical practice CTDI volume and DLP are displayed at the operation console of most CT units Despite its proportional relationship to total depositedThe personnel requirements, safety procedures, equipment and facility guidelines and quality assurance measures detailed in this Safety Code are primarily for the instruction and guidance of persons employed in Federal Public Service departments and agencies, as well as those under the jurisdiction of the Canada Labour CodeWe can convert CTDI w (=CTDI 100) to helical mode, and this is called the volume CTDI, or CTDI vol CTDI vol = CTDI w / 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 qualitycontrol measure
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Dec 30, · Following the jarring impact with the iceberg, once it was clear that the Titanic was in dire straits, operator Phillips keyed the message, "Come quick we have struck an iceberg its CQD SOS old man position 4146 N 5014 W MGY"By combining these parameters, we calculated CTDI w (mGy) using the following equation were calculated for each scan in the cohort using a Monte Carlo random sampling approach combined with NCICT organ dose calculator We learned from the sensitivity analysis that in case of brain dose in brain scan shared uncertainties have a major impact(ImPACT CT patient dosimetry calculator) To use of this software, CTDI air, mAs and the thickness and number of slices in each type of CT examinations should have been measured CTDI air was measured by pencil diode detector Results It was estimated that the annual collective dose and caput dose were about 3248
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This preview shows page 11 15 out of 16 pages Example 14 Calculate the power required of a 1400kg car under the following circumstances (a) The car climbs a 10 o hill at a steady 80 km/h;Its no good alright, i'm stuck with a homework problem again!Nov 26, 15 · Based on the selection and the total collimation input, normalised CTDI w (mGy/100 mAs) is displayed, which is derived from the builtin CTDI library Then other scanrelated parameters are entered such as pitch, tube potential (kVp), and current–time product (mAs), which will be used to calculate CTDI vol (mGy) and DLP (mGy cm)
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POSITION LAT 4146 N = LON 5014 W MGY The ship telegrapher had a message to get through if there was any hope of the target audience — other ships — getting there in time So the message had the what CQD — general call, CQ, followed by D, meaning distress Then came SOS (save our ship), struck iceberg, sinking fast, come to ourDose characterization, optimisation, and reference levels based on the CTDI concept have been well studied and understood for diagnostic CT Various organizations in the United States and EuropeFor helical scanners in current use, the parameter CTDI vol
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1 milligray mGy = 1 millisievert mSv From This online unit converter allows quick and pdl E (mSv) (mSv/mGycm) DLP (mGycm) CTDI W (mGy) x ="Physician shortages are prevalent across developing areas, where there are often less than two physicians per 100,000 people" daniel s ebbs, do, ms mgy chief medical officerBMI Calculator » Triangle Calculators » Length and Distance Conversions » SD SE Mean Median Variance » Blood Type Child Parental Calculator » Unicode, UTF8, Hexidecimal » RGB, Hex, HTML Color Conversion » GForce RPM Calculator » Chemical Molecular Weight Calculator » Mole, Moles to Grams Calculator » R Plot PCH Symbols » Dilution
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Table Table1 1 shows values of normalized CTDI w (mGy/100 mAs), measured at the maximum available beam width, for the body CT dosimetry phantom for CT scanners from two vendors obtained using the ImPACT dosimetry calculator These CT scanners range from single slice systems to 64 slice systems The ImPACT dosimetry calculator allows males and females to beObjective The dosimetric calculations in CT examinations are currently based on two quantities the volume weighted CT dose index (CTDI vol) and the dose–length product (DLP)The first quantity is dependent on the exposure factors, scan field of view, collimation and pitch factor selections, whereas the second is additionally dependent on the scan lengthDosimetry Calculator to generate D' liver (L) 21,101 Organ doses derived in this manner can be used to estimate the likelihood of a deterministic effect, as well as the organ stochastic risk 3,4 The effective dose (E) is generally recognized as a parameter that is directly related to the patient stochastic risk 6, and permits
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Explanation Work done, W = mgy where m = mass of stone = 12,000 lb, g = 32 ft/s² and y = vertical distance = 15 ft So, W = mgy = 12,000 lb * 32 ft/s² * 15 ft = 5,760,000 lbft²/s²W (mGy) 126 Kidneys 0025 0318 CDTI vol (mGy) 84 Remainder 2 0025 5191 0130 DLP (mGycm) 3612 Total Effective Dose (mSv) 6629 CT Bekken/abdomen ved Lab 2, Indre enfold, HF SØR v/ kvalitetsradiograf Berta Lohne ImPACT CT Patient Dosimetry Calculator version 099m, 1/07/02 Scan Description / Comments Update Data Set GEThis will tell you how to pick Toto numbers from past Singapore Toto ResultsA must watch video for every Singapore Toto puntersSubscribe our channel to new
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§ Make sure to bring your own calculator sharing of calculators is not permitted and will need it § As you know, NJIT has a zerotolerance policy for ethics code violations mgx = mgsinθ W mgy = mgcos θ F r = ma r = mv 2/r a r = v /r f = 1/T T = (2πr/v) Impulse F avr∆t = mv f mv I Momentum conserved if net impulse = 0Feb 01, 10 · Table Table1 1 shows values of normalized CTDI w (mGy/100 mAs), measured at the maximum available beam width, for the body CT dosimetry phantom for CT scanners from two vendors obtained using the ImPACT dosimetry calculator These CT scanners range from single slice systems to 64 slice systems The ImPACT dosimetry calculator allows males and femalesMake sure to bring your own calculator you will need it, and sharing of calculators is not permitted Students are not to communicate with each other once the exam has started All cell phones, pagers, or similar electronic devices must be turned off θ W mgy = mg
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A skier of mass 70kg is pulled up a slope by a motordrive cable A) hw much work is required to pull him 60 m up a 30º slope at a contant speed of 2m/s (frictionless)?Work done by a spring Ws==kx} kx}) Work done on a spring Wext = (ěkx} {kx}) Newton's law =ma Kinetic Energy K = mv2 Gravitational Potential Energy Ug = mgy Scalar product A B = A B Ay By A,B, Work done by gravity W = (mgy, mgy) Gravitational acceleration g 98 m/s Conservation of Energy Work done by an external force equalW mGy CatPhan ECO short Yes 1303 386 ECO full Yes 2270 958 HQ full Yes 31 1616 HQ full No 3755 1584 ConeBeam ECO short Yes 990 293 ECO full Yes 1665 702 HQ full Yes 3322 1401 ECO short No 1050 311 Body ECO eFOV No 2947 ECO eFOV Yes 2928 HQ eFOV No 5969
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0 A Different Volumes Of Water Are Moved Different Distances O B Water From The Same Horizontal Planes Is Lifted Different Distances O C Integration Is Necessary Because The Acceleration Of Gravity Changes At Each Leve O D Integration Is Necessary Because W MgyApr 21, 13 · A chain lying on the ground is 10m long and its mass is 80kg How much work is required to raise one end of the chain to a height of 6m?The work done by the jogger is against gravity, and equals W = mgy To find her average output, we divide W by the time it took a) The average power output was Since there are 746 W in 1 hp, the jogger is doing work at a rate of just under 1 hp A human cannot do work at this rate for very long b) The energy required is This result equals W = mgy
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Question Why Must Integration Be Used To Find The Work Required To Pump Water Out Of A Tank?CT dose index (CTDI) (measured in mGy) is a standardised measure of radiation dose output of a CT scanner which allows the user to compare radiation output of different CT scanners In the past CTDI 100 (measured over a 100 mm long ionisation chamber) and CTDI w (weighted average of dose across a single slice) were used;Oct 09, 1997 · This gives, W = mgy i Combining with Eq gives 1/2m(v f 2 0) = mgy i or PE i = KE f
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Apr 14, 14 · The normalised CTDI w (mGy/100 mAs) is calculated using the following formula where CTDI 100,center is the dose measured per 100 mAs at the centre of the CTDI phantom and CTDI 100,periphery is the average dose per 100 mAs from the four measurements conducted at the periphery of the phantomsUse 981 m/s^2 for gravity, and round to 3 significant figures I tried to use the formula Work = Integral of ( force on entire system at height x * dx) 80 kg / 10m = chain weighing 8 kg/m, so force on entire system = 8kg/m * x m Work =Oct 09, 04 · POWER!!!!!
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CTDIvol (mGy) is obtained by dividing CTDI w by pitch factor Another commonly used index is the doselength product (DLP) which factors in the length of the scan to show overall dose output DLP (mGy*cm) CTDI vol x scan lengthOf participants, and a CT dose calculator based on body size–dependent computational human phantoms We compared the body size–specific organ doses with the dose data based on International Commission on Radiological Protection (ICRP)compliant reference computational phantoms (ie, nominally 50th percentiles for height and weight)1 INTRODUCTION The dosimetry of small megavoltage (MV) photon fields is difficult The physical and theoretical challenges are outlined in several recent articles 13 These challenges have been recognized by major medical physics organizations and an IAEA and AAPM joint task group (TG 155) has been formed to provide guidance for medical physicists with respect to small field dosimetry
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