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Image Diagnostic Technology Ltd53 Windermere Road, London W5 4TJ
Tel: +44 (0)20 8819 9158 www.idtscans.com email: [email protected]
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Diagnostic Imaging
and
Radiation Safety
Anthony Reynolds BA MSc PhDRegistered Clinical Scientist CS03469
Image Diagnostic Technology Ltd.
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Who or what is IDT?
Image Diagnostic Technology Ltd aka “IDT Scans”
30,000 scans processed since 1991
• arranging dental CT/CBCT scans
• 3D processing
• radiology reports
• implant simulation
• 3D models
• surgical drill guides
Specialising in:
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www.idtscans.com
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Outline of Presentation
• Introduction / Disclosures
• Imaging for Dental Implants– Conventional Radiography
– CT / CBCT Scans
– Make Your Own Drill Guides
• Radiation Dose and Risk
• Rogues Gallery
• Quiz
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Need to be able to:
• Review patient anatomy and pathology
• diagnostic quality images
• Assess bone quantity and quality
• quantitative assessment
• Decide where implants should go
• accurate 3D measurements
• avoid sensitive structures
• must work mechanically and aesthetically
Imaging for Dental Implants
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Restoration-Driven Implant Planning
“Create a model of the desired
result, then work backwards to
determine how it can be achieved”
- Radio-Opaque Scanning Stents
- 3D Treatment Planning Software
- Surgical Drill Guides
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interactive implant planning software
SIMPLANT™ is a trademark of DENTSPLY Implants
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Guide resting on:
• Bone
• Mucosa
• Teeth
Guiding
cylinders
The SurgiGuide controls:
• Position
• Orientation
• Depth
SIMPLANT drill guide
SIMPLANT™ is a trademark of DENTSPLY Implants
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Software for planning Dental Implants
• SIMPLANT (DENTSPLY Implants)
• Blue Sky Plan (Blue Sky Bio)
• Osirix (with Dental3D plugin)
• In Vivo Dental (Anatomage)
• Nobel Clinician (Nobel Biocare)
• coDiagnostiX (Straumann, Dental Wings)
• ImplantMaster (iDent)
• SICAT (Sirona)
• etc etc
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Blue Sky Plan(Macintosh or PC)
• Free Software produced by Blue Sky Bio
• Can be used with any implant system
(but the implants are not realistic)
• Can import DICOM CT/CBCT data
• Can import STL files from optical scanners
• Can be used to design surgical drill guides
• Very powerful software, but not very user friendly!
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Surgical Drill Guides
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Place implants so accurately that a
(temporary) restoration can be fabricated
before the surgery takes place
The Ultimate Goal
“The Immediate Smile” – DENTSPLY Implants
“Teeth in an Hour” -- Nobel Biocare
“Smart Implants” – Limplant Ltd
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The Ultimate Goal
- To do this you have to rely on
your imaging!
Place implants so accurately that a
(temporary) restoration can be fabricated
before the surgery takes place
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Which Imaging Modalities are best?
• Intra-oral radiography• Occlusal films, bitewings, periapicals
• Extra-oral radiography• AP and Lateral cephs
• Conventional tomography• Dental Panoramic Tomography (DPT)
• Linear / Complex Motion Tomography (CMT)
• Magnetic Resonance Imaging
• Medical computed tomography (CT)
• Cone Beam computed tomography (CBCT)
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+ Very high resolution (20 lp/mm)
+ Fast, convenient, low dose
– No bone width
– No (quantitative) bone quality
– Magnification / Distortion
Intra-oral Imaging
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X-RAYS
FILM
TOOTH
Solutions:• bisecting angle
• paralleling technique
Distortion in intra-orals
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+ Good overview
– Width and height on midline only
– No (quantitative) bone quality
Extra-oral: Lateral Cephs
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Conventional Tomography(tomography by blurring)
T1 T2
Q
R
P
P1P2 R2 R1Q2 Q1
TUBE
FILM
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Dental Panoramic Tomography (DPT)
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+ Very good overview
– No bone width
– No (quantitative) bone quality
– Variable magnification => distortion
– Patient positioning is crucial
Dental Panoramic Tomography (DPT, OPG, OPT)
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DPTs are useful for:
• Overall status of teeth and supporting bone
• Anatomical anomalies and pathological conditions
• Triage between:– Sites where placing implants will be straight-forward
– Sites where grafting or distraction will be needed
– Sites where implants are not advisable
Reddy et al. Clin Oral Implants Res. 1994 Dec; 5(4):229-238− Errors as large as 30% in estimating bone height from DPTs
− Bone width cannot be estimated at all.
Measurements from DPTs are not accurate:
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Cross-Sectional Imaging
• Linear Tomography
• Complex Motion Tomography (CMT)
• Magnetic Resonance Imaging (MRI)
• Computed Tomography (CT or CBCT)
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Magnetic Resonance Imaging
+ no radiation dose
+ no metallic artefact
- large, expensive machine
- teeth generate no signal
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Computed Tomography (CT)(tomography by computation)
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(First paper on dental reformatted CT)
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Why 3D software is important
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Dental (CB)CT Scans
• Bony anatomy of Mandible, Maxilla,
Zygomatic Arches
• Useful for:➢impacted, supernumerary and abnormal teeth
➢root canals, root fractures
➢planning dental implants
➢periapical disease
➢cleft palate assessment
➢TMJ and airway analysis
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Cone Beam CT (CBCT) Scanner
GXCB-500™ is a trademark of Gendex Dental Systems of Lake Zurich, USA
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(Review Paper)
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DentoMaxilloFacial Radiology
CBCT Special Issue
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how CT works…
Godfrey Hounsfield
Nobel prize in Medicine,
1979
Allan Cormack
Animation courtesy of
Demetrios J. Halazonetis
www.dhal.com
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x-ray source
detectors
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acquisition
Animation courtesy of
Demetrios J. Halazonetis
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acquisition
Animation courtesy of
Demetrios J. Halazonetis
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acquisition
Animation courtesy of
Demetrios J. Halazonetis
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reconstruction
Animation courtesy of
Demetrios J. Halazonetis
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volume dataset
Animation courtesy of
Demetrios J. Halazonetis
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Animation courtesy of
Demetrios J. Halazonetis
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Animation courtesy of
Demetrios J. Halazonetis
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Animation courtesy of
Demetrios J. Halazonetis
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Voxels (Volume elements)
Animation courtesy of
Demetrios J. Halazonetis
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Voxels (Volume elements)
≈ 100 million voxels (200 Mb)400
slices512 x 512 x
density:0 - 4095
Animation courtesy of
Demetrios J. Halazonetis
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cone-beam CT(CBCT)
Animation courtesy of
Demetrios J. Halazonetis
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cone-beam CT(CBCT)
Animation courtesy of
Demetrios J. Halazonetis
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cone-beam CT(CBCT)
Animation courtesy of
Demetrios J. Halazonetis
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cone-beam CT(CBCT)
Animation courtesy of
Demetrios J. Halazonetis
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cone-beam CT(CBCT)
Animation courtesy of
Demetrios J. Halazonetis
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pulsed
x-ray tube
large
detector8cm x 8cm
adjustable
chair
adjustable
collimator4 to 8.6 cm height
8.6 or 15.6 cm width
CB-500 CBCT Scanner
Around £90K
fast scan times4.8s to 23s
low dosetypical Mx 35µSv
typical Mn 60µSv
Gendex™ is a trademark of Gendex Dental Systems of Lake Zurich, USA
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Gendex™ is a trademark of Gendex Dental Systems of Lake Zurich, USA
Around £45K
medium dosetypical Mx 60µSv
typical Mn 100µSv
variable mA
fixed scan times11s for SFOV
45s for MFOV
fixed collimator4cm x 6cm SFOV
8cm x 6cm MFOV
small detector
no chair
DP-700 CBCT Scanner
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Cannot fit mandible into 8cm Field Of View
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Toshiba Aquilion ONE medical CT Scanner
Aquilion™ is a trademark of Toshiba Medical Systems Corporation
Around £1M
320 detector rows
operates in cone
beam mode
0.5s scan time
Effective dosestypical Mx 70µSv
typical Mn 160µSv
volume capture24cm x 16cm max
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Axials Panoramics Cross Sections
Sagittal Coronal
Basic CT images
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Cross-sectional
Panoramic
Transaxial
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Segmentation
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Hyperdontia
Courtesy of Nicolette Schroeder
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Third Molars
Courtesy of Barry Dace
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Advantages of using a Scanning Stent
• Gives inter-arch stability for the patient during the scan
• Opens the bite slightly (a few mm) using occlusal stops
• Position and size of the desired restoration can be
visualised in the CT images
• If the maxilla and mandible are scanned togetherthe 3D image will illustrate the inter-arch relationship.
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Making a Scanning Stent
• Plastic and clear acrylic does not show up on a CT scan.
• To make it show up, you can:
• mix barium sulphate with the acrylic
• paint barium sulphate on the surface
• use radio-opaque teeth
• use markers made from a radio-opaque material
– lab putty
– gutta percha
– glass ionomer
• use a dual-scan technique.
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• We recommend using a barium sulphate-acrylic mix for both the
radio-opaque teeth and the baseplate.
• Use 15% barium sulphate in the teeth and 10% barium sulphate
in the baseplate. This allows the teeth to be picked out
separately.
• Do not use too much Barium Sulphate as it will cause an artefact.
• An accurate fitting stent with radio-opaque baseplate is usually
the best option for mucosa-supported surgical drill guides.
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Good Stent
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Mick Jagger ArtefactBad Stent
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Worse than Useless
Stent
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Dual Scan Technique
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Bone Mucosa Teeth
Bone Supported Guides:- Bone crest must be clearly visible in the CT images and ≥ 3cm long
Mucosa Supported Guides:
- Patient must be scanned with a radio-opaque scanning stent in place
Tooth Supported Guides:
- Tips of teeth must be clearly visible in the CT images
- A recent and accurate plaster cast will be required
Need to think about the Guide before you request the CT Scan!
Make Your Own Surgical Drill Guide
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Tooth Supported Guides
• Drill Guide will be supported on patient’s existing teeth
• Need a recent and accurate impression or plaster cast
• Optical (laser) scan of plaster cast
• Import optical scan into the implant planning software
• Guide will be designed to fit the plaster cast.
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Optical Scan of Plaster Cast
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BLUE SKY PLAN
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BLUE SKY PLAN
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Designing the Guide
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25mm
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Outline of Presentation
• Introduction / Disclosures
• Imaging for Dental Implants– Conventional Radiography
– CT / CBCT Scans
– Make Your Own Drill Guides
• Radiation Dose and Risk
• Rogues Gallery
• Quiz
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26 April 1986
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14 June 2017
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Dose Rate at Chernobyl (2017)• 1.35 microSievert per hour
Dose Rate in the UK (Average)• 0.3 microSievert per hour
Flight from the UK to Chernobyl• 3 hours x 2.5 μSv/hr = 7.5 μSv
Dental x-ray (intraoral)• 1 microSievert
CBCT scan (both jaws)• 60 microSievert
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Principles of Radiation Protection
• Justification (benefits must outweigh the risks)
• Optimisation (keep doses As Low As Reasonably Achievable)
• Dose Limits (1 mSv per year for members of the public)(no dose limits for medical exposures)
Diagnostically Acceptable
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Justification
• Under IR(ME)R 2000 we have a duty to ensure the
benefits of exposing the patient to radiation
outweigh the risks.
• But how do we know what the risks are?
• How do we manage the tradeoffs betweenbenefits and risks?
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Estimated excess relative risk (±1 SE) of mortality (1950–1997) from solid cancers among
groups of survivors in the LSS cohort of atomic bomb survivors, who were exposed to low
doses (<500 mSv) of radiation (2).
Brenner D J et al. PNAS 2003;100:13761-13766
©2003 by National Academy of Sciences
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The concept of Effective Dose
We know the risks from high doses of radiation• e.g. Atom Bomb survivors
• Atom Bomb survivors received whole body doses
• Dental patients receive doses to a very small region
• How can we relate the risks?
Effective Dose is a way of describing the dose to a
limited region in terms of the whole body dose that
would result in the same risk to the patient
Effective Dose is a measure of risk!
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More about Effective Dose
The Effective Dose calculation takes the size of the
region and the body parts irradiated into account.
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Eur J Radiol 81,2,267-271 (February 2012)
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Prof. Ria Bogaerts, Katholieke Universiteit Leuven, March 2011
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Prof. Ria Bogaerts, Katholieke Universiteit Leuven, March 2011
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Prof. Ria Bogaerts, Katholieke Universiteit Leuven, March 2011
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What is the Risk from a CBCT scan?
• Assume adult patient, dento-alveolar scan, both jaws
• Effective Dose might be 60 microSieverts
• Risk that patient might develop fatal cancer in 20 years time
= 5% (1 in 20) per Sievert (from ICRP103)
= 1 in 20 million for 1 microSv
= 60 in 20 million for 60 microSv
Health & Safety people
would call this a
“Minimal Risk”
= 1 in 300,000 (roughly) for 60 microSv
* If your patient is a child the risk is 3x more
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Risk varies with Age
5% per Sievert at age 30
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Typical Doses from Dental X-Rays
Effective Dose
(µSv) Risk
Intraoral (F speed, rect coll) 2
Intraoral (E speed, round coll) 6
Lateral Ceph 10
Panoramic 3 to 24
Cone Beam CT 19 to 1073
Medical CT (using dental protocol) 280 to 1410
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Typical Doses from Dental X-Rays
Effective Dose
(µSv) Risk
Intraoral (F speed, rect coll) 2 1 in 10 million Negligible
Intraoral (E speed, round coll) 6 1 in 3.3 million Negligible
Lateral Ceph 10 1 in 2 million Negligible
Panoramic 3 to 24
1 in 6.7 million to
833 thousand
Negligible to
Minimal
Cone Beam CT 19 to 1073
1 in 1.05 million to
1 in 19 thousand
Mimimal to
Very Low
Medical CT (using dental protocol) 280 to 1410
1 in 71 thousand to
1 in 14 thousand Very Low
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Want to Optimise
Benefit to Patient*
Risk to Patient
* not to the dentist!
Optimisation
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Practical ways to Reduce the Risk
1. Reduce the
Height
(vertical
collimation)
Reduces the risk
without loss of
benefit in most
cases.
Absorbed Dose outside primary beam is effectively zero
Dose
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More ways to Reduce the Dose
2. Reduce the mAs (tube current,
scan time)
- Reducing the mAs may have a
negative impact on image quality
- On some scanners, the voxel size
is linked to the mAs
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3. Reduce the Width (horizontal collimation)
• Absorbed Dose outside primary beam is not zero
(about 50% from SEDENTEXCT measurements)
• There may be some loss of benefit
X-ray TubeDetector
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“Sorry mate – no can do!”
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Fundamental Limitation of Small Field Of View
• CBCT measures the density within the Field Of View only
• Material outside the Field Of View has an unpredictable effect
• Software corrections means pixels may change with updates
X-ray Tube Detector
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Air should be black
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The Risk of Not Having a CBCT Scan
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Take the CT Scan first, do the surgery second (not the other way around)!
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Rogues Gallery
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CBCT 45µSv
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CBCT 145µSv
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Moving patient to
the side (without
reducing the Field
Of View) –
does it reduce the
dose?
8 cm
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8 cm
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Gendex DP-700
8cm x 6cm
0.2mm voxels
132.5 mAs
DLP 58.5 mGy.cm
Effective Dose
230μSv approx.
Gendex DP-700
4cm x 6cm
0.133mm voxels
79 mAs
DLP 35.9 mGy.cm
Effective Dose
150μSv approx.
IDT29826
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Toshiba Aquilion ONE
12cm x 6cm
0.25mm voxels
DLP 54mGy.cm
Effective Dose 150μSv
approx.
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IDT27563
i-CAT Classic
9.5cm x 5.4cm
0.25mm voxels
DLP 13mGy.cm
Effective Dose 50μSv
approx.
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1. Reduce the Height
2. Reduce the mAs
- linear reduction in risk, no loss of benefit in most cases
3. Reduce the Width
- linear reduction in risk, some loss of benefit
- less than linear reduction in risk, more loss of benefit
Quiz –
Which is the best way to reduce the dose?
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1. If I can’t see it in the images it didn’t receive any dose
2. If the Field Of View is small then the dose must be low
FALSE
4. If I can’t see it in the images I don’t have to report on it
TRUE
3. Even if the Effective Dose is high, it’s just a
small region so the risk is low FALSE
Quiz – True or False?
FALSE
(benefits the dentist not the patient)
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Quiz – True or False?
1. Medical CT scanners should never be used for dental scans.
2. My CBCT scanner runs at 85kVp instead of 120kVp so that means a lower patient dose.
FALSE
NEVER SAY NEVER
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True or False?
1. The smaller the Field Of View, the better.
2. The smaller the voxel size, the better.
3. The shorter the scan time, the better.
4. Radiation damage is cumulative.
5. The risk of cancer increases with the number of scans.
6. The CBCT scan was non-diagnostic but I shouldn’t repeat it because of the dose.
7. My patient has had several CBCT scans already - she shouldn’t have any more.
NOT ALWAYS
NOT ALWAYS
FALSE
TRUE AS FAR AS WE KNOW
FALSE
NOT FOR DIAGNOSTIC X-RAYS
NOT ALWAYS