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DICOM Network Roles

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Title: Seminario Geant4 INFN Author: bc+sc Last modified by: BC Created Date: 5/8/1997 12:59:37 AM Document presentation format: On-screen Show Other titles – PowerPoint PPT presentation

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Title: DICOM Network Roles


1
DICOM Network Roles
  • Successful communication - products must play
    opposite roles
  • Receive images Service Class Provider (SCP)
  • Send images Service Class User (SCU)

CT Image StorageSOP Class (SCU)
Network roles are defined for all DICOM Functions
2
DICOM Conformance Statement
  • It is Required!
  • It is a Public Document
  • It Conveys a Products DICOM Functionality
  • It is Based on DICOM Vocabulary
  • Abstract Syntaxes (SOP Classes), Transfer
    Syntaxes, SCU/SCP..
  • It is Used to Compare Connectivity
  • It is most Often on the Web _at_ Vendor Site
  • It Does Not Address All of an Applications
    Capabilities, but should Address All of the
    Applications DICOM ones

A Major Step Towards Interoperability
3
Language and dictionary
128 bit inutili (non sempre) DICM
4
std DICOM
5
DICOM
  • (0008,0000) UL 424 4 IdentifyingGroupLength
  • (0008,0020) DA 20070509 8 StudyDate
  • (0008,0022) DA 20070509 8 AcquisitionDate
  • (0008,0023) DA 20070509 8 ImageDate
  • (0008,0030) TM 163853 6 StudyTime
  • (0008,0032) TM 163933 6 AcquisitionTime
  • (0008,0060) CS CT 2 Modality
  • (0008,0070) LO Philips 8 Manufacturer
  • (0008,0080) LO OSP S.CROCE CUNEO 18
    InstitutionName
  • (0008,1040) LO RADIOLOGIA 10
    InstitutionalDepartmentName
  • (0008,1090) LO Brilliance 64 14
    ManufacturerModelName
  • (0010,0010) PN TEST CTDI 16 CM HEAD. 22
    PatientName
  • (0010,0020) LO 11111 6 PatientID
  • (0010,0030) DA 20070509 8 PatientBirthDate
  • (0010,0040) CS O 2 PatientSex
  • (0018,0050) DS 0.5 6 SliceThickness
  • (0018,0060) DS 120 4 KVP
  • (0018,0090) DS 500 4 DataCollectionDiamete
    r
  • (0018,1030) LO Encefalo Ax Testa 22
    ProtocolName

6
Images dimension
  • Ammettendo che ogni voxel occupi 32 byte qual è
    lo spazio RAM necessario a simulare 40 cm di TAC
    di cui il seguente è parte dellheader DICOM di
    unimmagine?
  • circa 170 MByte
  • circa 2 Mbyte
  • circa 670 Mbyte

7
Geant4-DICOM interface
  • Developed by L. Archambault, L. Beaulieu, V.-H.
    Tremblay (Univ. Laval and l'Hôtel-Dieu, Québec)
  • Donated to Geant4 for the common profit of the
    scientific community
  • under the condition that further improvements and
    developments are made publicly available to the
    community
  • Released with Geant4 5.2, June 2003 in an
    extended example
  • by S. Guatelli mainly
  • Deeply revised in by Pedro Arce in 2007
  • Small improvements by S. Chauvie

T. Aso A.Kimura Ashikaga Institute of
Technology
Geant4 examples/extended/medical/DICOM
8
From phantom to MC
9
cont

  •              Density
    Range                   Materials             
    -------------------------------------------------
    --                  g/cm3                       
         -                    ----------------------
    -----------------------------            
    0.100 , 0.351                  Lungs (inhale)
                 0.351 , 0.800                 
    Lungs (exhale)              0.919 , 0.979
                     Adipose                    
    0.979 , 1.004                  Breast        
                 1.004 , 1.043                 
    Phantom                     1.043 , 1.109
                     Liver                      
    1.109 , 1.113                  Muscle        
                 1.113 , 1.400                 
    Trabecular Bone             1.496 , 1.654
                     Dense Bone               

ICRU 46
10
and ends.
11
The structure
12
From DICOM image to Geant4 geometry
  • Reading image information
  • Transformation of pixel data into densities
  • Association of densities to a list of
    corresponding materials
  • Defining the voxels
  • Geant4 parameterised volumes
  • parameterisation function material

13
Start reading DICOM files
14
Tranlsate TAGS with DICT
15
Read the header and create the tag
16
Implicit Endian Explicit VR, special cases
17
Implicit Endian Explicit VR, other cases
18
Implicit Endian Implicit VR
19
Create .g4dcm
20
Data.dat
21
CT2Density.dat
22
Write density
Splitting materials in density intervals In the
class DicomDetectorConstruction, it is defined a
density interval G4double densityDiff 0.1
23
Navigation.
  • The 1D optimisation . It will be very slow
    because each time a track exits a voxel it has to
    loop to all other voxels to know which one it may
    enter
  • The 3D optimisation with G4SmartVoxel a 3D grid
    is built, so that the location of voxels is fast,
    but it requires a lot of memory
  • Using G4NestedParameterisation. The search is
    done hierarchically in X, Y and Z. It is fast and
    does not require big memory
  • Using G4PhantomParameterisation/G4RegularNavigati
    on an special algorithm to navigate in regular
    voxelised geometries (see GEANT4 doc). This is
    the fastest way without any extra memory
    requirement (and it is the default in this
    example). It includes an option (default) to skip
    frontiers between voxels when they have the same
    material. When using this option at each step the
    energy is all deposited in the last voxel for
    properly distribution of the dose
    (energy/volume) the G4PSDoseDeposit_RegNav
    scorer can be used

24
MC Dose calculation in Radiotherapy
How accurate is the dose calculation ?
Description of patients
Energy deposition
Physics
Geometry
Validation studies
DICOM
25
Grazie per lattenzione!
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