NTIMAGE.H

The public symbol file NTKRPAMP.PDB for the original release of Windows 10 tells that the kernel is built with the NTIMAGE.H header at

d:\th.public.fre\ddk\inc

and draws from it the following type definitions:

Line Number	Type
67	struct _IMAGE_DOS_HEADER
184	struct _IMAGE_FILE_HEADER
248	struct _IMAGE_DATA_DIRECTORY
259	struct _IMAGE_OPTIONAL_HEADER
302	struct _IMAGE_ROM_OPTIONAL_HEADER
371	struct _IMAGE_NT_HEADERS
517	struct _IMAGE_SECTION_HEADER
519	unnamed union Misc in _IMAGE_SECTION_HEADER
1843	struct _IMAGE_DEBUG_DIRECTORY
1979	struct _NON_PAGED_DEBUG_INFO
2083	enum ReplacesCorHdrNumericDefines

The header NTIMAGE.H has long been supplied with the publicly available Device Driver Kit (DDK) and Windows Driver Kit (WDK).