DICOM PS3.3 2022d - Information Object Definitions

C.10.12 Waveform Filter Characteristics Macro

This Macro contains properties of analog and digital filters applied to waveform data. It can be used for filter settings applied on the recording device at the time of data acquisition as well as for filter settings used to achieve a specific waveform display.

Table C.10.12-1. Waveform Filter Characteristics Macro Attributes

Attribute Name

Tag

Type

Attribute Description

Waveform Filter Type

(003A,0322)

1

The type of filter.

Enumerated Values:

ANALOG

DIGITAL

Filter Low Frequency

(003A,0220)

1C

Nominal 3dB point of lower frequency of pass band in Hz. This is the cutoff frequency of a high-pass filter.

Required if the filter is a high-pass filter.

Shall be consistent with Filter Low Frequency (003A,0220) in the enclosing Dataset, if present.

Filter High Frequency

(003A,0221)

1C

Nominal 3dB point of upper frequency of pass band in Hz. This is the cutoff frequency of a low-pass filter.

Required if the filter is a low-pass filter.

Shall be consistent with Filter High Frequency (003A,0221) in the enclosing Dataset, if present.

Notch Filter Frequency

(003A,0222)

1C

Center frequency of the notch filter in Hz.

Required if the filter is a notch filter.

Notch Filter Bandwidth

(003A,0223)

2C

Nominal 3dB bandwidth of the notch filter; in Hz.

Required if the filter is a notch filter.

Analog Filter Characteristics Sequence

(003A,0323)

1C

Characteristic parameters of the analog filter.

Required if Waveform Filter Type (003A,0322) is ANALOG.

A single Item shall be included in this Sequence.

>Analog Filter Roll Off

(003A,0324)

1

The slope of the filter response between pass-band and stop-band given in dB/octave.

>Analog Filter Type Code Sequence

(003A,0325)

1

A coded descriptor of the type of analog filter.

>>Include Table 8.8-1 “Code Sequence Macro Attributes” .

BCID 3042 “Analog Waveform Filter”.

Digital Filter Characteristics Sequence

(003A,0326)

1C

Characteristic parameters of the digital filter.

Required if Waveform Filter Type (003A,0322) is DIGITAL.

A single Item shall be included in this Sequence.

>Digital Filter Order

(003A,0327)

1

Filter order is the maximum delay, in samples, used in creating each output sample.

>Digital Filter Type Code Sequence

(003A,0328)

1

A coded descriptor of the type of digital filter.

>>Include Table 8.8-1 “Code Sequence Macro Attributes” .

BCID 3043 “Digital Waveform Filter”.

Waveform Filter Description

(003A,0329)

3

A textual description of the filter.

Filter Lookup Table Sequence

(003A,032A)

3

A Lookup Table defining the filter.

>Include Table C.10.13-1 “Waveform Filter Lookup Table Macro Attributes” .


DICOM PS3.3 2022d - Information Object Definitions